单项选择题

The chairman of the department, together with some other teachers, ______a conference for the purpose of laying down certain regulations.

A．is planning
B．are planning
C．plan
D．have planned
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单项选择题
Animals are quite different from human beings ______ animals have no aptitude for language learning.
A．in which
B．in what
C．in that
D．in how
单项选择题
The passenger must have had an accident: ______ he would have arrived by that time.
A．therefore
B．otherwise
C．so
D．nevertheless
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