25．It suddenly occurred to him he had left his keys in the office.
(A)whether
(B)where
(C)which
(D)that

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YS Lin 小二上 (2014/07/19)
此句是occur to sb(想到; 想起)的典型句式，是学习occur单词的一个重点方面。that这里是做主语从句的连接词。

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高考◆英语◆江西省題庫下載題庫