问题补充：
Her son was accused of cheating by the police, made it difficult for her to go to sleep.
A. what
B. as
C. which
D. where
答案：
A. what
B. as
(答案→)C. which
D. where
解析：选C考查定语从句。句意：她的儿子被警察指控犯了诈骗罪，这使她睡不着觉。此处which引导非限制性定语从句，指代前面整个内容。
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