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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

試題分析：考查時態(tài)。從時間狀語since the 1990s，可知應該使用現(xiàn)在完成時或現(xiàn)在完成進行時，然后根據后面主句的謂語動詞have started可推斷，do 這個動詞還在繼續(xù)，故使用現(xiàn)在完成進行時。句意：自從20世紀90年以來，史密斯夫婦開了一家小公司，此外他們還一直在做農活。
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