单项选择题

"Not until science became prominent ______ be abolished," some people argue.

A. did slavery come to
B. slavery to
C. had slavery come to
D. that slavery came to
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单项选择题
From this material we can ______ hundreds of what you may call direct products.
A. derive
B. discern
C. diminish
D. displace
单项选择题
Some companies have introduced flexible working time with less emphasis on pressure ______.
A. than more on efficiency
B. and more efficiency
C. than efficiency
D. and more on efficiency
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