It suddenly occurred to me I hadn’t locked my doorA. whichB. whereC. that D. whether

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A. which
B. where
(答案→)C. that
D. whether
解析：
试题分析:句意：我突然想到我没有锁门。固定句型：It occurred to sb that从句，“某人突然想起某事”，it是形式主语，that从句是真正的主语，答案选C。