英语语法选择题(说明原因)

问题描述:

英语语法选择题(说明原因)
1.Sheep _____genetically engineered.
A.have being B.are been C.are being
2."We _____that this is a major concern for phone users,"said the spokesman.
A.learnt B.had learnt C.have learnt
3.I can do that job.I_____one of those machines before.They____the same printer software at my old company.
A.used B.have used

这几个题目是考察你对完成时的考察.首先你看一下现在完成时是什么:现在完成进行时态表示过去的动作对现在造成的影响,但是这个动作可能会对现在停止也可能会延续下去.1.are being.sheep是基因工程试验这个行为的接受...