单项选择题

The Solo Trek is able to lift off the ground by using（）.

A．a solar powered engine
B．engine-powered twin fans
C．large flapping wings
D．rotating blades

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I am feeling sick. I （）so much chocolate.

A. needn’t have eaten
B. couldn’t have eaten
C. mustn’t have eaten
D. shouldn’t have eaten
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Had he worked harder, be （）the exams.

A. must have got through
B. would have got through
C. would get through
D. could get through
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