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
解析：句意：当你看书时，最好在你有问题的地方做个标记。where在这里引导地点状语从句。故选D。
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
解析：句意：当你看书时，最好在你有问题的地方做个标记。where在这里引导地点状语从句。故选D。
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