单项选择题

Lisa was busy taking notes ______ Mark was searching the Internet for the information.

A. until
B. unless
C. while
D. if
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单项选择题
The scientists wanted to keep people ______ about the breakthrough in their experiment.
A. inform
B. informed
C. informing
D. to inform
单项选择题
Our students are free to study ______ interests them.
A. that
B. whichever
C. whatever
D. anything
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