问题描述：
Doing your homework is a sure way to improve your
tests scores ,and this is especially true -------classroom tests
A.before you take
B.since you have
C.when it comes to
D.unless it concerns
tests scores ,and this is especially true -------classroom tests
A.before you take
B.since you have
C.when it comes to
D.unless it concerns
问题解答：
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