单项选择题

They have ______ their friend for twenty minutes.

A． expected
B． waited for
C． looked forward to
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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
单项选择题
Johnson ______in that company since he came to London.
A． worked
B． is working
C． has worked
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