Paper _____ first invented in China.A.is B.are C.was D.were如何做
问题描述:
Paper _____ first invented in China.A.is B.are C.was D.were如何做
答
A 这个是一个客观事实,paper是不可数名词,当用单数,锁定A
Paper _____ first invented in China.A.is B.are C.was D.were如何做
A 这个是一个客观事实,paper是不可数名词,当用单数,锁定A