单项选择题

Skating can be good for you （） correctly.

A．though doing
B．though done
C．if done
D．if doing

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单项选择题
This is only one of the laundries in the district （） modern equipment.

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