单项选择题

On no account ______ ever leave the baby at home alone.

A．should you
B．you should
C．shall you
D．you shall
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单项选择题
My pain ______ apparent the moment I walked into the room, for the first man I met asked sympathetically: Are you feeling all right
A．must be
B．must have been
C．had been
D．had to be
单项选择题
It turned out that the children were not ______ for the accident.
A．to blame
B．to be blamed
C．to be blaming
D．to have been blamed
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