单项选择题

What a pity! Considering his ability and experience, he（）it better.

A. need have done
B. must have done
C. can have done
D. might have done

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单项选择题
But for their help, we（）the program in time.

A. can not finish
B. will not finish
C. had not finished
D. could not have finished
单项选择题
—I wonder how much you charge for your services. —The first two are free（）the third costs $30.

A. while
B. until
C. when
D. before
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