单项选择题

Doing your homework is a sure way to improve your test scores, and this is especially true ______ it comes to classroom tests.

A. as
B. since
C. when
D. after
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I was on the point of going to bed ______ Mr. Zhang rang.
A. as
B. when
C. while
D. and
单项选择题
About ______ the people of the town are workers.
A. sixty percent
B. sixty percent of
C. percent sixty
D. sixty percents of
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