单项选择题

The oscillator was easier to use, more stable, and less expensive than others available at the time.()

A. changeable
B. unchanging
C. diverse
D. strong

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The conference explored the possibility of closer trade links.()

A. denied
B. investigated
C. stressed
D. created
单项选择题
As a writer, he turned out three novels that year().

A.refused
B. read
C. produced
D. accepted
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