选择题：__________your valuable help, we couldn't have finished the experiment ahead of

题目内容：

__________your valuable help, we couldn't have finished the experiment ahead of time.

A.If it were not for

B.Had it not been for

C.Were it not for

D.If it has not been for

参考答案：

答案解析：

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分类：教师资格题型：选择题

分类：教师资格题型：选择题

分类：教师资格题型：选择题