______ happened to be no one in the building when the fire broke out.

admin2009-05-04  27

问题 ______ happened to be no one in the building when the fire broke out.

选项 A、It
B、There
C、This
D、That

答案A

解析 本题考查代词it的用法。It happened to be表示“碰巧”。
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