We often receive various requests from customers, but _______ on real estate related contracts.

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问题 We often receive various requests from customers, but _______ on real estate related contracts.

选项 A、focus
B、focusing
C、focused
D、focuses

答案A

解析如果在空格后面看到了连接平行成分的连词(but，and，or等)，就要通过分析句意来判断空格内填入的词语应当与句中的哪一个词搭配。空格前面的but后面省略了we，所以应填入谓语动词。这里能和we搭配的动词是A选项。C选项是过去式，而这里没有理由使用过去式。

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