2. 外语
  3. We have done things we ought not to have done and______undone things we ought to have done.

We have done things we ought not to have done and______undone things we ought to have done.

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问题 We have done things we ought not to have done and______undone things we ought to have done.
选项 A、leave
B、leaving
C、left
D、will leave
答案C
解析 leave后面可以跟带现在分词、过去分词、不定式、形容词、介词短语的复合结构以及其他情况，如：Don’t leave her waiting．It’s better to leave some thingsunsaid．I’ll leave you to settle the business．His illness has left him weak．I’ll leave it to youto buy the tickets／leave buying the tickets to you．本题的leave后面跟的是带过去分词的复合结构，由于宾语太长(后面有定语)，将过去分词undone提到宾语things的前面了。
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