单项选择题

Since we purchased the new equipment, ______ has been significantly increased.

A. producer
B. produced
C. production
D. produces
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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
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
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