单项选择题

When you read books, you had better make marks（）you have questions.

A. where
B. in where
C. at which
D. which

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单项选择题
She does not know（）for her first job interview.

A. what should she wear
B. what to be wore
C. what to wear
D. what will she wear
单项选择题
It was not until dark（）it was time to return home.

A. that he realized
B. that did he realize
C. when he realized
D. when did he realize
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