{01}—How long is it _____ we last met?
—About five years. You haven"t changed much.
A.before
B.since
C.when
D.that
解析：
本题选B。
{02}Doing your homework is a sure way to improve your test scores and this is especially true _____ it comes to classroom tests.
A.when
B.since
C.before
D.after
解析：
本题选A。
—About five years. You haven"t changed much.
A.before
B.since
C.when
D.that
解析：
本题选B。
{02}Doing your homework is a sure way to improve your test scores and this is especially true _____ it comes to classroom tests.
A.when
B.since
C.before
D.after
解析：
本题选A。
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