单项选择题

People used to think that the earth was flat, ______

A．don't they
B．wasn't it
C．didn't they
D．usedn't it
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填空题
The football match had to be stopped. They ______ (play) for half an hour when there was a terrible storm.
单项选择题
Will come and lend us a helping hand on such an awkward occasion
A．Who do you think
B．Whom do you suppose
C．Whom do you think
D．Do you suppose who
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