单项选择题

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

A) informed
B) informing
C) inform
D) to inform
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Some people waste food, ______ others haven't enough.
A) since
B) because
C) while
D) if
单项选择题
Visitors of our company decided to stay in that city for ______ two days as they wanted to have a look around.
A) other
B) the other
C) another
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