2. 专升本
  3. They overcame all the difficulties and finished the plan seven days ahead of schedule,( )was something we had not expected.

They overcame all the difficulties and finished the plan seven days ahead of schedule,( )was something we had not expected.

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问题 They overcame all the difficulties and finished the plan seven days ahead of schedule,( )was something we had not expected.
选项 A、it
B、that
C、what
D、which
答案D
解析
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