单项选择题

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

A. when
B. since
C. before
D. after
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单项选择题
As the mountains were covered with a ______ of cloud, we couldn't see their tops.
A. coating
B. film
C. veil
D. shade
单项选择题
______, both his father and mother died.
A. At the age of six

B. Being six years old
C. He was six years old

D. When he was six years old
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