题目内容：

where _____ my sister's trousers. 空格里用are 还是is 阿

优质解答

glasses, shoes, socks, trousers, gloves等名词往往用复数形式,故谓语用复数.如： The trousers are very cheap and I want to take them.
除非写的是 a pair of trousers , 则用单数