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
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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
单项选择题
Some of the low-end made-in-China mechanical-electronic products are not selling well in export market as compared with what are termed as high-end ones.
A. on export market
B. in exporting market
C. in exported market
D. in the export market
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