单项选择题

Scientists should be kept ______ of latest developments in their research areas.

A. inform
B. informing
C. informed
D. to inform
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单项选择题
Although he didn’t feel well, he insisted ______ going there together with us.
A. to
B. on
C. at
D. for
单项选择题
We don’t deny that your products are superior in quality to ______ of Japanese make.
A. the one
B. that
C. these
D. those
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