单项选择题

They must ______ for us; let's hurry up.

A．wait
B．have been waited
C．waited
D．be waiting
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You can ______ different kinds of people, dictionaries or encyclopedia to find out what you wish to know.
A．contact
B．contain
C．consult
D．convert
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I always ______ the length of time I'll take to do something; therefore, no plan is accomplished yet.
A．esteem
B．underestimate
C．underlie
D．estimate
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