单项选择题

（）he comes, we would not be able to go.

A. Without
B. Unless
C. Except
D. Even

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单项选择题
By the time you （）back, the supper （）ready.

A. will get; will be
B. get; was
C. get; will be
D. will get; is
单项选择题
It was （）he worked hard that he succeeded.

A. because
B. for
C. as
D. since
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