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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单项选择题
() explain it to him, he still didn't understand.

A. Hard as I tried to
B. As I tried hard to
C. Hard I tried to
D. Tried as I hard to
单项选择题
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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