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

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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
单项选择题
You can never imagine what great trouble I have had（）the patient who received a serious wound.

A. treat
B. to treat
C. treating
D. treated
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