单项选择题

（）many difficulties，they still went on with their experiment.

A.Face
B.Faced
C.Facing with
D.Faced with

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单项选择题

（）we’d arrived there we had a wonderful time.

A.Only
B.Once
C.One time
D.One more

单项选择题

It’s foolish to（）your time.

A.waste
B.leave over
C.spend
D.damage

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