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
Those are old rules. They don't ______ any more.
A) apply to
B) apply for
C) apply
D) be use//
单项选择题
______ had the plane landed than the people ran towards it.
A) No sooner
B) Hardly
C) Seldom
D) Now that
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