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

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【单选题】_______yourvaluablehelp,wecouldn'thavefinishedtheexperimentaheadoftime.

A、Ifitwerenotfor
B、Haditnotbeenfor
C、Wereitnotfor
D、Ifithasnotbeenfor

参考答案:

B

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