单项选择题

China, as a developing country, should speed up her ______ development and improve the people's life level.

A. economical
B. economy
C. economic
D. economics
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单项选择题
More than one-third of the Chinese in the United States live in California,______ in San Francisco.
A. previously
B. predominantly
C. practically
D. permanently
单项选择题
Until then, his family ______ from him for six months.
A. didn't hear
B. hasn't been hearing
C. hadn't heard
D. hasn't heard
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