单项选择题

He used () that there was nothing he couldn't do.

A.believe
B.to believe
C.to have believed
D.believed

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单项选择题

()she is young, she knows quite a lot.

A.Although
B.However
C.When
D.Unless

单项选择题

I can't help()his expression when he receives the gift.

A.to imagine
B.imagine
C.imagining
D.to have imagined

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