单项选择题

He was seen ______ the classroom this morning.

A．to enter
B．entering
C．have entered
D．enter
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单项选择题
This problem will be ______ discussed in Chapter 2.
A．deep
B．enough
C．further
D．farther
单项选择题
Peter is one of the few persons I know who ______ learnt from experience.
A．has
B．was
C．had
D．have
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