单项选择题

Medicine should not be kept______it is approachable to children.

A．when
B．where
C．which
D．that
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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
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
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