His success was due to the fact that he
had been working
had been working
（work） hard all the time.

【答案】had been working

【解答】

【點評】

聲明：本試題解析著作權屬菁優(yōu)網所有，未經書面同意，不得復制發(fā)布。

發(fā)布：2024/4/20 14:35:0組卷：5引用：1難度：0.8

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A．were waiting	B．had been waiting
C．has waited	D．would waited

A．had been repairing	B．was repairing
C．has been repairing	D．would be repairing

His success was due to the fact that he had been workinghad been working（work） hard all the time.