单项选择题

A teacher should not show ______ for any one of his pupils.

A．profession
B．preference
C．priority
D．prosperity
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单项选择题
______ for your advice, we'd never have been able to overcome the difficulties.
A．Had it not
B．If it were not
C．Had it not been
D．If we had not been
单项选择题
I have two elder brothers, ______ in the army for ten years.
A．the elder of whom served
B．the older having served
C．the older of which served
D．the elder one has served
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