2. 外语
  3. The examination has been cancelled. You ______ all that revision, after all.

The examination has been cancelled. You ______ all that revision, after all.

admin2009-02-10  20
问题 The examination has been cancelled. You ______ all that revision, after all.
选项 A、didn’t need to have done
B、needn’t have done
C、need to do
D、needn’t do
答案B
解析 needn’t have done表示没必要做，但已做了。
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