题目内容
【题目】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】it作形式主语，真正的主语为that he had left his keys in the office。且that在句中无意义，并不充当任何成分。
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题目内容
【题目】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】it作形式主语，真正的主语为that he had left his keys in the office。且that在句中无意义，并不充当任何成分。