2. 专升本
  3. ( )your valuable help, we couldn’t have finished the experiment ahead of time.

( )your valuable help, we couldn’t have finished the experiment ahead of time.

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问题 ( )your valuable help, we couldn’t have finished the experiment ahead of time.
选项 A、If it were not for
B、Had it not been for
C、Were it not for
D、If it has not been for
答案B
解析
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