问题
选择题
_ we were walking along the river, we heard a cry for help.
A．While
B．Until
C．After
D．Before
答案
答案：A
题目分析：句意：当我们沿着河边走时，我们听到了求助声。while正当……时候。故选A。
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_ we were walking along the river, we heard a cry for help.
A．While
B．Until
C．After
D．Before
答案：A
题目分析：句意：当我们沿着河边走时，我们听到了求助声。while正当……时候。故选A。