单项选择题

I will be late ______ I leave immediately.

A．unless
B．until
C．if
D．or
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单项选择题
By the end of this July, ______ English for six year.
A．is studying
B．have studied
C．has studied
D．shall have studied
单项选择题
She was working for the whole day and just ______ to have a piece of bread.
A．broke down
B．broke off
C．broke through
D．broke up
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