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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I am rather concerned ______ her, for I haven't heard from her since last winter.
A) of
B) at
C) with
D) about
单项选择题
Only under special circumstances ______ to take make-up tests.
A. are freshmen permitted
B. freshmen are permitted
C. permitted are freshmen
D. are permitted freshmen
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