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    精英家教网 > 高中英语 > 题目详情

    In addition to the farming they ______ since the 1990s, the Smiths have started a small business.

    A．have doneB．had been done
    C．were doingD．have been doing

    D

    解析试题分析：考查时态。从时间状语since the 1990s，可知应该使用现在完成时或现在完成进行时，然后根据后面主句的谓语动词have started可推断，do 这个动词还在继续，故使用现在完成进行时。句意：自从20世纪90年以来，史密斯夫妇开了一家小公司，此外他们还一直在做农活。
    考点：考查时态。

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