Question

they could have come to your help,but they_____in a traffic jam A had been caught b should catch

c were caught d caught
哪个啊？要详细的解释的！

Answer 1

对不起，是我理解错题意了

选C
解析：这是一个虚拟语气，表示对现在事实的虚拟表示与过去事实相反的情况 结构为：主语+过去时+其他+主语+should/would/could/might+do+其他 例：
1.If I were you, I would take an umbrella.如果我是你，我会带把伞。（事实：我不可能是你）
2.If I knew his telephone number, I would tell you. 如果我知道他的电话号码，我就会告诉你。（事实：不知道）
3.If there were no air or water, there would be no living things on the earth. 如果没有水和空气，地球上就不会有生物。(事实：地球上既有空气也有水)
4.If I had any money with me, I could lend you some. 如果我带钱了，我就会借给你些。（事实：没带钱）
5.If he studied harder, he might pass the exam.如果他再努力些，就能通过考试了。（事实：没有努力

虚拟语气是很重要的一个语法，希望能帮到你

翻译：他们本来应该来帮助你的，但是他们被卷入了让一场交通事故

追问

问一个额外的问题
he insisted that a medical team _____to the flooded immediately.
a is sent b be sent
答案是A　　　但是大家都说是B

追答

由insist that + （should） do 构成的虚拟语态从句 ，should 可以省略，即：insist+动词原形

这个题我选A

Answer 2

A had been caught
本来应该。。。

追问

答案 选C。。。。。。。。
什么情况

Answer 3

were caught