题目内容：
自1978年经济改革以来，中国经济以年均近10%的速度增长，使其国民生产总值几乎翻了两番。A.Since economic reform began in 1978, an average growth rate of almost 10% a year has seen
B.Since economic reform began in 1978, an average growth rate of almost 10% a year has seen
C.Since economic reform in 1978, China’s economy grows at a rate of almost 10% a year and ma
D.Since economic reform in 1978, China’s average growth rate is almost 10% a year and has wi
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