单项选择题

I'm afraid I can't see you this afternoon, because I ______ tennis with Frank.

A．would be playing
B．would play
C．will have Been playing
D．am playing

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单项选择题

______ , leaves from certain trees such as the maple turn into bright colours.

A．During the fall
B．With the fall
C．While the fall
D．Along the fall

单项选择题

______ percentage of working women in the United States has doubled since 1940 has been the result of both economic and social factors.

A．The
B．That the
C．There is the
D．It is the

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