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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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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