单项选择题

You could become a good musician, but your lack of practice is ______ you ______.

A. taking; up
B. holding; back
C. making; up
D. leaving; out
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单项选择题
The country ______, most of the Americans hurry home before the night falls.
A. hasn't been cleaned up
B. having not cleaned up
C. having not been cleaned up
D. is not cleaned up
单项选择题
______give us help is welcome.
A. Who ever
B. Whoever
C. No matter who
D. Those who
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