单项选择题

We looked for a table to sit down, but they were all ______

A．reserved for
B．engaged in
C．used up
D．taken up
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单项选择题
Hemingway's enduring contribution to the human being is his insistence that grace ______ under pressure.
A．is to be kept
B．has been kept
C．should have been kept
D．be kept
单项选择题
You should have put the milk into the refrigerator, I expect it ______ bad by now.
A．went
B．had gone
C．has gone
D．goes
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