Question

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

A．have done	B．had been done
C．were doing	D．have been doing

Answer 1

D

試題分析：考查時(shí)態(tài)。從時(shí)間狀語(yǔ)since the 1990s，可知應(yīng)該使用現(xiàn)在完成時(shí)或現(xiàn)在完成進(jìn)行時(shí)，然后根據(jù)后面主句的謂語(yǔ)動(dòng)詞have started可推斷，do 這個(gè)動(dòng)詞還在繼續(xù)，故使用現(xiàn)在完成進(jìn)行時(shí)。句意：自從20世紀(jì)90年以來(lái)，史密斯夫婦開(kāi)了一家小公司，此外他們還一直在做農(nóng)活。