It never _____ humans until the mid­1990s that some animals can be cloned.A.occurB.is occurredC

题目简介

It never _____ humans until the mid­1990s that some animals can be cloned.A.occurB.is occurredC

题目详情

It never _____  humans until the mid­1990s that some animals can be cloned.
A.occurB.is occurredC.occurred toD.occurred
题型:单选题难度:中档来源:不详

答案

C

试题分析:It occurs to sb that 某人突然想到...,occur to 发生,突然想到。。。句意:直到20世纪中期人类才突然想到克隆出一些动物。
点评:注意句型的识记。

更多内容推荐