Question

【选择题，翻译，语法】

So uncertain（ ）about the background of his audience that he didn't know how to start
his lecture.
A.he would become
B.would he become
C.he had become
D.did he become
选哪个呢?为什么?

Answer 1

So uncertain（ ）about the background of his audience that he didn't know how to start
his lecture.
A.he would become
B.would he become
C.he had become
D.did he become

选哪个呢?为什么?
答：D
译：他对听众的背景情况是如此的不确定以至于他都不知道如何开讲。
析：so... that....句型将so...部分提到句首引起主句的部分倒装，排除AC。
本题句讲的是过去发生的一件事情，所以用一般过去时较好。排除B。
PS: would 可用于讲述过去的经常发生的事情。比如说某人年青时，常会一个人坐在河边发楞，就可以说：when he was young, he would sit by the river thinking.
本题选B缺少必要的铺垫。单选题一般不从文章中挖句子来考。
但本题句的become用得不好。怎么是“变得”呢？好象话中有话，又是一个故事。感觉用：So uncertain was he about ....较好，就事论事说的就是过去一件事，因为对听众的背景情况不是很肯定（而不是变得不很肯定），因而不知道如何开讲。
因为如果原来是清楚的，肯定的，不会became uncertain, 如确实由certain变成uncertain,则其中必有故事！单选题不要让我们去猜测补全语境。

Answer 2

选C，这里是表语前置现象，将he had become so uncertain 中的 so uncertain 前置。
这里用 had become 是因为在did之前，是过去的过去，所以是过去完成时
翻译： 他很不确定听讲者的身份背景，所以他不知道该怎么开始他的讲座。

Answer 3

A 是肯定会变成背景

Answer 4

应该是c吧，不确定······