单项选择题

Jobnson ______ in that company since he came to London.

A．worked
B．is working
C．has worked
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单项选择题
Let's go and see the flower show ______ you finish your homework.
A．while
B．as soon as
C．until
单项选择题
If you ______ finish your work now, you must finish it tomorrow.
A．can't
B．needn't
C．may not
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