Question

提个英语问题，在线等，急！ The headmaster has always got some______from the students.

空格是complaint还是complaints?
请各位高手附上解释

Answer 1

表示 抱怨,抗议,怨言时可数
表示 抱怨的缘由时不可数
1.抱怨;抗议;怨言;抱怨的缘由[C][U][(+about/over/against)]
There is no real reason for complaint.
没有什么可抱怨的理由。
2.【律】控告;控诉[C][(+against/with)]
The storekeeper signed a complaint accusing them of shoplifting.
店主签署了控告书,指控他们在店里扒窃货物。
所以是complaints

Answer 2

The headmaster has always got some___complaints___from the students.

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为什么？