private cars are bringing us convenience, they may also cause traffic accidents and pollution.
A．WhenB．SinceC．whileD．As
C
句意:盡管私人車(chē)輛給我們帶來(lái)了方便，然而他們也可能引起了交通事故和污染。while雖然，盡管。所以選C。
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