单项选择题

When（）with a strong enemy, they had always retreated.

A. being faced
B. facing
C. faced
D. being facing

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单项选择题
The committee （） the problem for a whole afternoon but they have not yet reached an agreement.

A. has discussed
B. has been discussing
C. are discussing
D. have been discussing
单项选择题
I'd have come with you （） I am so busy.

A. except for
B. provided that
C. but that
D. so long as
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