题目内容

Jack is a great talker. It’s high time that he _____ something instead of just talking.

A. will do
B. has done
C. do
D. did

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_____ the morning train, he would not have been late for the meeting.

A. Did he catch
B. Should he catch
C. Has he caught
D. Had he caught

People are recycling many things which they _____ away in the past.

A. had thrown
B. will be throwing
C. were throwing
D. would have thrown

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www.163.com是Internet中主机的（）。

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B. 密码
C. 别名
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