单项选择题

The library needs ______, but it'll have to wait until Sunday（）

A. cleaning
B. be cleaned
C. clean
D. being cleaned

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单项选择题
It is not considered （）to litter in public.

A. respectful
B. respective
C. respected
D. respectable
单项选择题
I remember______ him once when I was staying with my aunt.（）

A. to see      
B. seeing      
C. see      
D. saw
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