单项选择题

Researchers from developing countries have gathered ______ the effects of recent increases in air pollution.

A. analyst
B. analysis
C. analyze
D. to analyze
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单项选择题
After it was revealed that the automobile manufacturer lacked ______ to product quality, the manufacturer lost most of its loyal customers.
A. remittance
B. commitment
C. endurance
D. investment
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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