单项选择题

Classification is a useful ______ to the organization of knowledge in any field.

A．means
B．approach
C．mode
D．manner
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单项选择题
You should have put the milk into the icebox, I expect it ______ undrinkable.
A．became
B．had become
C．has become
D．becomes
单项选择题
Those were the graduate assistants ______ to do the research work in the lab.
A．to whom it was their responsibility
B．whose responsibility there was
C．whose responsibility was
D．of whom with the responsibility
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