单项选择题

Before ______ home, commuters are advised to check traffic conditions.

A. leave
B. to leave
C. leaving
D. left
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单项选择题
A told B. spoke C. said D. asked
A told
B. spoke
C. said
D. asked
单项选择题
A. contribution B. decision C. understanding D. attitude
A. contribution
B. decision
C. understanding
D. attitude
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