The accident has reached a point _____ the police have to be called in.

A. when
B. that
C. which
D. where
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科目：高中英語 來源：0116 期末題 題型：單選題

The accident has reached a point _____ the police have to be called in.
[     ]
A. when
B. that
C. which
D. where

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