It’s very convenient us to buy train tickets now because we can buy them either from the

It’s very convenient us to buy train tickets now because we can buy them either from the station or on the Internet.
A. to
B. of
C. by
D. for

A. toB. ofC. by(答案→)D. for解析：句意：现在我们购买火车票非常便利，因为我们可以在火车站或者网上购买。it is +adj+for +sb to do sth 该句型中当形容词是物性的时，用for,当形容词是人性的时，用of.故选D

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