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
______ begins with ______.
A．Knowledge, practice
B．The knowledge, practice
C．The knowledge, the practice
D．Knowledges, practices
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
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