Do you know how long the dinosaurs _____ on the earth before their extinction?A．

题干

Do you know how long the dinosaurs _____ on the earth before their extinction?

A．had existed	B．had been existed
C．have existed	D．have been existed

上一题下一题 0.64难度单项选择更新时间:2014-12-17 08:51:31

小学学科试题库

初中学科试题库

高中学科试题库