need 做情态动词时用于否定句和疑问句
做肯定句时用need to do
C如果改成 need cleaning 或need to be cleaned
Must we clean the classroom now?No,you needn't.It ______ after school.
Must we clean the classroom now?No,you needn't.It ______ after school.
A.may clean B.must clean C.need be cleaned D.can be cleaned
[正确答案是D,为什么不选C]
A.may clean B.must clean C.need be cleaned D.can be cleaned
[正确答案是D,为什么不选C]
英语人气：539 ℃时间：2019-12-13 02:26:28
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