单项选择题

When our university laboratory bought this microscope we were given a one year's

A．reservation
B．security
C．proof
D．guarantee
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单项选择题
It is absurd that women ______ be paid less than men for doing the same work.
A．are to
B．ought
C．would
D．should
单项选择题
We won't encourage him to do that ______ he is in good health.
A．even if
B．in case
C．even though
D．when
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