单项选择题

The ancient Egyptians are supposed _________ rockets to the moon.

A．to be sending
B．to send
C．to have sent
D．to have been sending
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单项选择题
You may leave it to _________.
A．we two
B．us two
C．our two
D．I two
单项选择题
I have to give up my job in advertising because I can't keep up with the rapid _________ of work.
A．rate
B．pace
C．speed
D．velocity
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