单项选择题

My teacher told me seriously that I should keep ______of that fellow who always caused troubles.

A．clean
B．cleanly
C．clear
D．clearly
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单项选择题
Among all the proposals, it was quite preferable that Mr. Li, a very experienced engineer,______ the task.
A．undertook
B．undertake
C．undertaking
D．would undertake
单项选择题
That customer wanted to return the pens he bought because he said they ______ easily.
A．didn't write
B．weren't written
C．were not writing
D．hadn't been writing
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