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
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
单项选择题
Mr. Yang,（）for his famous invention, was invited to give a lecture in the technical university.

A. was known
B. knowing
C. was knowing
D. known
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