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
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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
单项选择题
In the long run, English learning, difficult as it is, is ______ to a learner iii his or her career devel- opment.
A．profitable
B．advantageous
C．prominent
D．rewarding
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