SAT语法疑问请帮忙

Question

Hannah finished building her new all-purpose projects room last year,(A)and she has been working in the room for since.(B)and since that time she has worked there,为什么选A不选B？

The validity of personality testa as accurate measures of a person's innate capacious and desires (A) has been frequently called into question. (B) is frequently called into question,为什么选A不选B？

The prosecutor argued that anger and (a desire) for vindication were not efficient reasons....这里为啥是a desire,而不是desire?

The benefits of exercise (A) are as much psychological as physical. (B) have psychological aspects as well as physical ones.正确答案为A，我第一感觉也是A，但后来觉得越读越诡异，为什么只是形容词而非名词。于是就选了B

Because our casserole was smilingly bad as it baked,the food science teacher came over to ask us what we had put (in it).我个人感觉put in 就行了，为什么要put in it.请高人帮忙解答。

Answer 1

1. 用完成进行时强调她从那以后一直在那个屋子里工作。
2。用完成时态表示一直受到疑问。
3。desire 是可数名词。
4。这个题本来就是用形容词来修饰benefits的表示既有心理上的也有身体上的好处。
5。what we had put in the casserole. 我们在里面放了什么来自：求助得到的回答