The man assured himself that the bridge was safe before ______it.A、crossB、acros

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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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