- Must I clean the Lable now?
- No, you ____.  You may do it later.
A．can’tB．needn’tC．mustn’tD．shouldn’t
B
考查must的否定回答.句意:我必須現(xiàn)在就打掃實驗室嗎?_不,你不必.你可以稍后打掃.must 提問的回答，可用needn’t /don’t have to，故選B
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