单项选择题

Turn off the light before you （）

A. leave
B. left
C. had left
D. is leaving

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单项选择题
The Huanghe River is not so （） as the Changjiang River.

A. longer
B. long
C. longest
D. along
单项选择题
Neither Tom nor Jack and I （） his students.

A. are
B. am
C. is
D. was
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