Change the following from active to passive: Do the experts regard this compound as hazardous?
Is this compound regarded as hazardous by the experts?
The original sentence is a question in the simple present tense ("Do the experts regard..."), so its passive form must also stay in the simple present.
The object of the active sentence, "this compound," becomes the subject of the passive sentence, and the simple present passive question form is "Is this compound regarded as hazardous by the experts?"
The options using "Has... been regarded," "Is... being regarded," and "Was... regarded" shift the tense to present perfect, present continuous, and simple past respectively, none of which match the simple present tense of the original active sentence.
Hence, the answer is Is this compound regarded as hazardous by the experts?
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Select the option that expresses the given sentence in passive voice.
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