北京中考英语单选33题.Lots of books __to the poor students in the countrysi_英语解答

北京中考英语单选33题.
Lots of books __to the poor students in the countryside every year.
A.send B.sent c.are sent D.were sent

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解答

选C能否解释一下为何不选4D楼上已经解释了，every year 每年是一个一般现在时的标志