_____ many times, but he still doesn’t know how to operate the machine properly.A.Although I have sh

题目简介

_____ many times, but he still doesn’t know how to operate the machine properly.A.Although I have sh

题目详情

_____ many times, but he still doesn’t know how to operate the machine properly.
A.Although I have shown himB.I have shown him
C.Having been shownD.Having shown
题型:单选题难度:中档来源:不详

答案

B
考查句子结构。因为句子中有but,所以前面也应该是一个句子。答案为A。如果本题没有but,答案就应该是C。句意:我已经给他展示过很多次了,但是他仍然不知道怎么样恰当地操作机器。

更多内容推荐