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  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 考查虚拟语气和倒装。由主句谓语可知本题是与过去事实相反的虚拟条件句，条件从句谓语用“had+过去分词”，如果省略if，从句要用倒装语序，即把had移到主语前面，故选B。
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