They _____ learned about _____ French songs by the end of last month.A.had; three hundredsB.have; three hundredsC.had; three hundredD.have; three hundred
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C解析根据句末的by the end of last month（到上月底为止），可判断需用过去完成时，先排除B、D两项；当hundred与数词连用表示具体数目时，词尾不能加s，故弃A选C。