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        1. 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:

            考查介詞在固定句型It is + adj.+ for / of sb.to do sth.中的使用。convenient不能說明主語的特征,因此用for,故選D。


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