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
His request ______ us completely by surprise.
A．shook
B．made
C．took
D．lea
单项选择题
If the whole framework of the thesis ______ beforehand, a great deal of time and energy would have beeh saved.
A．was designed
B．had been designed
C．were designed
D．has been designed
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