问题
选择题
While reading, you'd better make a mark ___ you have any questions.
A．on which
B．at where
C．the place where
D．where
答案
答案：D
这是一个定语从句，从句中缺表示地点的状语，所以选D。
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While reading, you'd better make a mark ___ you have any questions.
A．on which
B．at where
C．the place where
D．where
答案：D
这是一个定语从句，从句中缺表示地点的状语，所以选D。