帮忙解释一下几道初中的英语题目

帮忙解释一下几道初中的英语题目
1.I think ______nessecary to look for more information about the book.
A.it B it wasC that D this
(我选了B,可正确答案是A,it was 不可以吗)
2.I like watching TV______to the cinema.
A more than to go B more than goingCthan goingD rather than to go
(我选了C,可正确答案是B)
3. She felt bad for_____a chance to study abroad.
A having not givenB nothaving given Chaving not been given D not having been given
(我选了A,正确答案是D)
4. Ladies and gentlemen,now please allow me to ______Mr Wang to you.
A showB introduceC recommendD invite
(我选了C,正确答案是B,“介绍”和“推荐”有很大区别吗)

其实这些题目我之前都百度过的,但他们都说的不清楚,把我越搞越晕了~~
所以拜托哪个英语好的解释一下耶!
不要太罗嗦,我看到一大堆不知道在讲什么的文字就恶心的~~
（说得清楚就行）