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
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◎ 解析
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◎ 知识点
根据n多题专家分析，试题“In addition to the farming they ______ since the 1990s, the Smiths have started a small business.A．have doneB．had been doneC．were doingD．have been doing…”主要考查了你对 【一般现在时】，【将来进行时】，【过去完成进行时】，【过去将来时的被动语态】 等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。
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