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

I am sure he is up to the job ______ he would give his mind to it.

A．if only
B．in case
C．until
D．unless

单项选择题

John D. Rockefeller,______, owned 90 percent of all American oil refineries.

A．as still a young man
B．while still a young man
C．a young man however
D．in spite of a young man

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