----Must we clean the classroom now?
----No, you _________. It _________ after school.
A．needn’t, must be cleanedB．mustn’t, needn’t be cleaned
C．needn’t, can be cleanedD．don’t have to, may clean
C

試題分析：句意為：---我們現(xiàn)在必須打掃教室嗎？---不必。教室可以放學(xué)后打掃。must引起的一般疑問句，其否定回答應(yīng)用needn’t，表示不必。根據(jù)語(yǔ)境，it（指教室）是動(dòng)作的承受者，應(yīng)用被動(dòng)語(yǔ)態(tài)。故選C。
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