单项选择题

By the time you get to Beijing tomorrow, I ______ for Shanghai.

A．shall have left
B．am leaving
C．will leave
D．have already left
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单项选择题
As the shortage of certain metals approaches, others must be found to take their ______
A．share
B．role
C．place
D．shape
单项选择题
I don't know why he ______ in the middle of a sentence.
A．broke away
B．broke out
C．broke through
D．broke off
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