单项选择题

This is only one of the laundries in the district（） modem equipment.

A．that have
B．which have
C．that has
D．what has

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单项选择题
The doctor tried to do an experiment to find out the（）of the medicine on the mice.

A．cause
B．result
C．reason
D．effect
单项选择题
Scientists say it may be five or six years （）this medicine is tested on human beings.

A．since
B．before
C．after
D．when
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