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Inadditiontothefarmingthey

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Inadditiontothefarmingthey

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

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

【回答】

D

知识点:动词时态与语态

题型:选择题

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