单项选择题
You should have put the milk in the ice box; I expect it ________ undrinkable by now.
A．became
B．had become
C．has become
D．becomes
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单项选择题
The ratio of the work done by the machine ________ the work done on it is called the efficiency of the machine.
A．against
B．with
C．to
D．for
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单项选择题
________ the flood, the ship would have reached its destination on time.
A．In case of
B．In spite of
C．Because of
D．But for
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