单项选择题

By the middle of the 21st century, the vast majority of the world’s population ______ in cities rather than in the country.

A．are living
B．will be living
C．have lived
D．will have lived
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单项选择题
I ______ him the Christmas gift by mail because he came home during the Christmas holidays.
A．ought to have sent
B．couldn’t have sent
C．must have sent
D．needn’t have sent
单项选择题
It has been proposed that we ______ our decision until the next meeting.
A．delayed
B．delay
C．can delay
D．are to delay
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