It suddenly occurred to him he had left his keys in the office.A. whether B. whereC. which D. that

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【题目】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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【答案】D

【解析】

试题分析：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。It为形式主语，that这里是做主语从句的连接词。句意：他突然想起他把钥匙忘在办公室了。