题目内容

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

答案：D
解析：

　　考查介词在固定句型It is ＋ adj．＋ for / of sb．to do sth．中的使用。convenient不能说明主语的特征，因此用for，故选D。


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