单项选择题

Those were the graduate students ______ to do the research work in the lab.

A．to whom it was their responsibility
B．of whom the function was
C．whose responsibility was
D．of whom with the responsibility
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单项选择题
Sometimes, changing our way of thinking, ______.
A．the problems become simpler and clearer
B．we will find the problems simpler and clearer
C．the simpler and clearer the problems will become
D．the problems will become simple and easy
单项选择题
A．SoB．AsC．AfterD．Before
A．So
B．As
C．After
D．Before
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