单选题：Don’t turn off the computer before closing all programs ____

题目内容：

Don’t turn off the computer before closing all programs _________ you could have problems A．or
B．and
C．but
D．so

参考答案：

答案解析：

已知△ABC中，AB=AC=3，，则BC长为（　　）

已知△ABC中，AB=AC=3，，则BC长为（　　）A．3 B．4 C．5 D．6

分类：英语题型：单选题

A person who banters isA．singing B．insulting C．joking D．Deceiving

分类：英语题型：单选题

In the last paragraph， the writer again refers to the fire as a living creature

分类：英语题型：单选题

分类：英语题型：单选题

Who are the first to make the success of sit-in become true?A．Black college stud

分类：英语题型：单选题