请求英语语法高手帮帮我. 在下感激不尽

Question

1The reason why I plan to go to college is ____if I don’t
A.because she will be disappointed
B.because she will have been disappointed
C that she will be disappointed
D for she will be disappointed
完全不知道怎么入手. 还请高手详解

2.Have you investigated ____ in scientific locations?
A.are there many people
B how many people are there
C how many people there are
D.that there are how many people
C 答案都知道，麻烦就是详细解释一下 原因不知道

3.It wasn’t such a good dinner ____she had promised us
A.that B which C as D what
我觉得这里应该是强调句 所一选了A 但答案是C 还请高手分析分析

Answer 1

1.C
一般有reason就不会用because在同一个句子里面，用that来引导表语从句
2.部分倒装
there be 句型的常识 在从句中 需要部分倒装
3.C
as 为 “正如”句子翻译为：这顿饭并不如她向我们承诺的那么好
强调句 是 It be + 强调的部分+that +从句
强调句 一般可以省略 强调的部分 可以直接翻译句子 但是这句 当强调的部分省略 句子为It wasn’t that she had promised us 缺少宾语补足语 promised 什么 ， 这少了 所以不是强调句。

Answer 2

1.C that she will be disappointed
固定句型 the reason why…is that…
2.宾语从句 陈述语序
3.意思是 这顿饭并不如她向我们许诺的那么好
as是“正如”的意思

Answer 3

17a
2凡是HV has开头 都要倒装 助动词前移 好难讲明白 我记得是否定词还有一些是这样
3第一感觉是C 我觉得呢 意思是说正如AS她预示的那顿饭不怎么样