单项选择题

Dr. Kim ______ for 12 years on the Board of New York University by the time she resigns next February.

A. been served
B. had served
C. has served
D. will have served
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单项选择题
Once considered to be in danger of ______ , whales now enjoy themselves in the ocean thanks to the wildlife conservation program.
A. withdrawal
B. resolution
C. decadence
D. extinction
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