It
It
suddenly occurred to him that he had left his keys in the office.

【答案】It

【解答】

【點評】

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發(fā)布：2024/4/20 14:35:0組卷：4引用：1難度：0.5

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A．As is required	B．It is required
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ItItsuddenly occurred to him that he had left his keys in the office.