The airport is usually your first stop before______on your vacation or trip.

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问题 The airport is usually your first stop before______on your vacation or trip.

选项 A、leave
B、leaving
C、left
D、to leave

答案B

解析本题考查介词before的用法。根据语法规则，介词后通常使用名词或动名词作宾语，由此确定本题答案为B)。

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大学英语三级A级

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