单项选择题

She undertakes to verify the true source of the rumor.

A. tries
B. decides
C. promises
D. refuses
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单项选择题
Please let me know if any problems arise.
A. become
B. occur
C. raise
D. arouse
单项选择题
Experiments enable young scientists to judge accurately what must be accepted and what must be viewed with suspicion.
A. doubt
B. belief
C. curiosity
D. judgment
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