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
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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
单项选择题
See to it that you ______ the solutions to whatever problems you came across in your paper last time.
A．found
B．find
C．will find
D．you have found
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