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一道英语完型填空题.Insurance companies_______people in certain areas

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一道英语完型填空题.
Insurance companies_______people in certain areas to install the alarms before they will give them insurance for the past year.
A.have been asking
B.have been asked
C.asked
选什么?为什么?把语法点说出来.
A
首先 for the past year那要用现在完成时,C排除,而是保险公司要求人们……,所以是主动选A