单项选择题

She ought to make a shift now; she is in a bad mood because she ______ in the dull work too long.

A．had engaged
B．is engaging
C．has been engaging
D．engaged
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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
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