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
The ______ of three and five is four.
A．avenue
B．subtraction
C．average
D．total
单项选择题
In order to improve our working conditions. this new scheme must be______.
A．adopted
B．adapted
C．addicted
D．adorned
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