It's very convenient ______ us to buy train tickets now because we can buy them either from the station or on the Internet.

题型：单选题题类：常考题难易度：普通

A、to B、of C、by D、for

举一反三

There are African arts and crafts of all kinds {#blank#}1{#/blank#} {#blank#}2{#/blank#}.

—Thank you.

He {#blank#}1{#/blank#}fall asleep {#blank#}2{#/blank#} he {#blank#}3{#/blank#}the reason last night.

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