单项选择题

We watched carefully ______ the house.

A．during she walked against
B．during she walked towards
C．while she walked against
D．while she walked towards
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单项选择题
—Was that the dean who walked by—______.
A．It must he that
B．It must have been
C．He must be it
D．That must have been it
单项选择题
—Will you be able to finish the job this week—______.
A．I can’t say so
B．I’m not sure so
C．I don’t know so
D．I don’t expect so
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