单项选择题

You should have put the milk in the icebox; 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
According to the man, what contributes to booming of job market
A．There will be more graduates this year.
B．Economy is soaring.
C．Starting salaries are raised.
D．Job searching tools are greatly advance
单项选择题
As to the experiments taken at the Mayo Clinic, which of the following statements is true
A．Each volunteer took the same amount of food with about 1000 calories.
B．Volunteers had to wear special devices to record their weight.
C．It turned out that those who had more walking up and down stairs gained much less weight than others.
D．In the experiment every volunteer gained weight.
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