--Must I clean the classroom now, Miss Wang?
--No, you needn’t . It                by Bill.
A．is cleaningB．should be clean
C．was cleanedD．has been cleaned
D
句意：我必須現(xiàn)在打掃教室嗎？不，不必。比爾已經(jīng)打掃了。It和clean之間是被動系，用被動語態(tài)，而且強(qiáng)調(diào)對現(xiàn)在的影響，用現(xiàn)在完成時(shí)態(tài)的被動語態(tài)。選D。
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