单项选择题

There are many different ways of comparing the economy of one nation with those of another.

A. that
B. this
C. what
D. which
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单项选择题
Having finished lunch, the case was discussed.
A. they discussed the case
B. they had discussed the case
C. the case was discussed
D. the case had been discussed
单项选择题
The hands on this clock are lubricate so that it can be seen in the dark（）.

A. luminous
B. luminary
C. lugubrious
D. lubricable
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