题型：单选题题类：模拟题难易度：普通

Few people knew how to use the Internet in the past,_____?

A、did they B、didn't they C、did he D、didn't he

举一反三

— . I've been busy talking with John on the phone all the morning.

John failed to catch the last bus， {#blank#}1{#/blank#}?

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