【題目】It suddenly occurred to him he had left his keys in the office.

A. whether B. where

C. which D. that

【答案】D

【解析】

試題分析：此句是occur to sb.(想到; 想起)的典型句式，是學習occur單詞的一個重點方面。It為形式主語，that這里是做主語從句的連接詞。句意：他突然想起他把鑰匙忘在辦公室了。

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