单项选择题

I had no sooner closed the door （） somebody started knocking on it.

A. as
B. before
C. than
D. when

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Why is （） you are not well prepared for the class.

A. it
B. that
C. that it
D. it that
单项选择题
A person’s calorie requirements vary （） his life.

A. across
B. throughout
C. over
D. within
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