单项选择题

________ and wage increases have not kept in step.

A. Production
B. Product
C. Produce
D. Productivity
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单项选择题
_________ drills that have no real topic have to remain as they are.
A. Manufacture
B. Manipulative
C. Manipulate
D. Manifest
单项选择题
The disappearance of her paper has never been ________.
A. counted for
B. looked up
C. accounted for
D. checked up
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