题目内容

They received a number of _____ from customers about the lack of parking facilities.
A.complainsB.complaintsC.complainerD.complainers
B
句意:他们收到了许多来自顾客的抱怨关于缺乏停车设备。名词,抱怨complaint,题中a number of 修饰可数名词复数,所以选B。
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