2. 外语
  3. You should look over this document carefully before(sign)________it.

You should look over this document carefully before(sign)________it.

admin2021-03-16  45
问题 You should look over this document carefully before(sign)________it.
选项
答案signing
解析 before为介词,且sign和you是主动关系,所以用-ing形式。故填signing。
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