单项选择题

If you are constantly looking back,______pretty good you will fall into a hole ahead.

A．it is
B．there is
C．chances are
D．possibilities are
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单项选择题
Our Math teacher must be in his office now. No, he ______ be there. I saw him in the library a minute ago.
A．can't
B．couldn't
C．mustn't
D．wouldn't
单项选择题
If the company ______in that way for much longer, it will end up in the bankruptcy court.
A．carries out
B．carries on
C．carries away
D．carries off
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