They were walking in the street( ) he saw thema.whileb.whenc.as soon asd.before

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They were walking in the street( ) he saw thema.whileb.whenc.as soon asd.before

They were walking in the street( ) he saw thema.whileb.whenc.as soon asd.before
They were walking in the street( ) he saw them
a.while
b.when
c.as soon as
d.before

They were walking in the street( ) he saw thema.whileb.whenc.as soon asd.before
B.when 引导的从句为短暂性动词,必用一般过去式,如果主句为延续性动词,则用过去进行时.

B
后面是过去时,所以排除C
前面是过去进行时,所以排除D
前面是延续性动词,后面是短暂性动词,排除A

选b
while是表示同时,所以根据句子的意思应该是他看到他们的时候他们正在街上走着。
所以while ,as soon as,before都可以排除。

B (固定用法:当一个动作发生的时候,用‘一般过去时’,另一个动作正在进行,用‘过去进行时’)

B

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