单项选择题

There ______ means of knowing what is happening.

A．be
B．is
C．are
D．have
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单项选择题
A worker ant has two ______, one for itself, and one for carrying food to the folks back home .
A．stomachs
B．stomach
C．stomaches
D．kinds
单项选择题
You ______ be tired after such a long journey.
A．must
B．should
C．can
D．have to
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