单项选择题

It's nearly seven o'clock. Jack ______ be here at any moment.

A．must
B．need
C．should
D．can
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单项选择题
He placed the ladder ______ the wall and climbed onto the top of the house.
A．on
B．against
C．before
D．in
单项选择题
______ in a white uniform, he looks more like a cook than a doctor.
A．Dressed
B．To dress
C．Dressing
D．Having dressed
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