问题
选择题
_____ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.
A．While
B．As
C．If
D．Since
答案
答案：A
while表示对比，意思接近whereas“当……却……”。
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_____ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.
A．While
B．As
C．If
D．Since
答案：A
while表示对比，意思接近whereas“当……却……”。