单项选择题

I am not sure whether I want to take this course; I may（）for the first week to see if I like it.

A. sit on
B. sit in
C. sit down
D. sit up

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单项选择题
In Boston, as in the rest of the United States,（）schooling begins at age 5 and ends at 16.

A. obliged
B. compulsory
C. compelling
D. forced
单项选择题
（39）（）

A. when
B. since
C. for
D. whereas
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