单项选择题

Is （） true that the scientist will give us a lecture next week

A. this
B. that
C. it
D. what

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单项选择题
The library needs （）, but it'll have to wait until Sunday.

A. cleaning
B. be cleaning
C. clean
D. being cleaned
单项选择题
Tom lived in a northern city（）

A. at some time
B. in the time
C. for one time
D. at one time
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