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

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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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Only when you have a good knowledge of grammar （） write correctly.

A. you will
B. you can
C. can you
D. can't you
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