Select the most appropriate option to fill in the blank. ________ I cannot understand is how you could walk so far.
What
Look at what the blank has to do. It opens a clause that serves as the subject of the main verb is. Such a clause is a nominal relative clause, and it needs a word that carries its own antecedent inside itself.
The answer. What does exactly this: it means ‘the thing which’. So the sentence reads ‘The thing I cannot understand is how you could walk so far’ — complete and correct.
Why the others fail:
Which — must refer back to a noun already mentioned. Nothing precedes the blank, so it has no antecedent to point to.
When — introduces a clause of time, which would ask about the moment of not understanding. That does not fit the structure.
How — introduces a clause of manner, and it already appears later in the sentence. Using it twice would leave the subject position without a proper head.
Takeaway: when a clause has to be the subject, only what (or whatever, whoever) can head it, because only these contain their own antecedent.
Similar Questions
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Important Questions from Fill in the Blanks
Directions: Fill in the blanks with the word that best completes the sentence.
At times he gets very angry, and then no one can_______ him.
Each of the following sentences has a blank space and four words are given below it. Select the word or group of words you consider most appropriate for the blank space and indicate your response accordingly.
Many people today have fallen into utter confusion of values with the result that they cannot______ the good from the bad.
Each of the following sentences has a blank space and four words are given below it. Select the word or group of words you consider most appropriate for the blank space and indicate your response accordingly
If Mohan________ at 5 a.m., he would not have missed the train.
Each of the following sentences has a blank space and four words are given below it. Select the word or group of words you consider most appropriate for the blank space and indicate your response accordingly.
His property was divided ______ his daughters and sons.
Each of the following sentences has a blank space and four words are given below it. Select the word or group of words you consider most appropriate for the blank space and indicate your response accordingly
His persistence in his misdemeanours has lowered him in the________ of everyone who knows him.
