题目内容

____ they arrived at the bus stop, the bus had gone.

A. Since
B. Till
C. Once
D. Before

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I will write it down____ I forget.

A. untli
B. when
C. before
D. as

I have known Jacky Chan____ I was a boy.

A. that
B. what
C. since
D. if

We must camp____ we can get water.

A. when
B. where
C. who
D. what

I will go back to the village____ I came from.

A. where
B. since
C. what
D. when

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