单项选择题

If ever again（）happens an accident like this, we will have only ourselves to blame.

A. it
B. so
C. there
D. that

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单项选择题

Somebody in the next room must be ill,（）a doctor has just come out.

A. because
B. for
C. in that
D. as

单项选择题

I don't think I'll need any money but I'll bring some（）

A. at last
B. in case
C. once again
D. in time

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