单项选择题

Today dozens of scientific group in different countries have been _______ the goal of a practical and economic way to use sunlight to split water molecules.

A．reaching
B．winning
C．chasing
D．pursuing
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单项选择题
It is necessary that an efficient worker _______ his work on time.
A．accomplishes
B．can accomplish
C．accomplish
D．has accomplished
单项选择题
I hope you will never fall into that _______.
A．mistake
B．fault
C．error
D．defect
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