we were driving slowly along the lake ___________ we heard a cry for help

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we were driving slowly along the lake _____ we heard a cry for help.
A.when B.till C.after

A.when 时间状语从句 意思是"就在这个时候"
这是习思考试20007春季四级考试题

a

a

A,意思是"就在这个时候"

B因为前面的DRIVING是延续类动词,所以后面可以用TILL表示我们一直在做某事直到......

A,两个动作是同时发生的