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what后面加were还是was是加单数还是负数,如果答语是复数

题目详情
what后面加were还是was
是加单数还是负数,如果答语是复数
▼优质解答
答案和解析
单数就用was (is的过去式)
负数就用were (are的过去式)
如:
What was this book?
What were those photoes?