Since the last quarter of 2010, there______a rapid fall in the volume of exports

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问题 Since the last quarter of 2010, there______a rapid fall in the volume of exports in this country.

选项 A、is
B、was
C、had been
D、has been

答案 D

解析这是一道语法题，考点是动词的时态。动作发生在过去，但持续到现在，应该用现在完成时。

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