问题
选择题
When you read the book, you'd better make a mark ____ you have any questions. [ ]
A. at which
B. at where
C. the place
D. where
答案
答案：D
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When you read the book, you'd better make a mark ____ you have any questions. [ ]
A. at which
B. at where
C. the place
D. where
答案：D