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
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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
单项选择题
He was ______ determined than you, but he turned out to be the first to back out.
A．no more
B．not more
C．no less
D．not less
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