The man assured himself that the bridge was safe before ______it.

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问题 The man assured himself that the bridge was safe before ______it.

选项 A、cross
B、acrossing
C、crossing

答案C

解析 cross 与across 的区别在于前者是动词“穿过”,而后者是介词例如:come across。题中的before 是介词,因此后面应该用动名词形式。
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