we were driving slowly along the lake ___________ we heard a cry for help
问题描述：
we were driving slowly along the lake ___________ we heard a cry for help
we were driving slowly along the lake _____ we heard a cry for help.
A.when B.till C.after
答
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