非谓语选择题.I have（ ）that nobody is allowed to smoke here.

非谓语选择题.I have（ ）that nobody is allowed to smoke here.
A.made clear
B.to be clear
C.made it clear
D.made things clear
答案选C,求讲解!为什么.这道题主要考察什么?
答：此题的考点并不是非谓语动词,而是形式宾语.
I have made sth.clear.我已经将某事表达清楚了.make sth.clear 在这里是谓语动词.
make是一个复宾动词,后跟复合宾语.sth.是宾语,形容词clear是宾语的补足语.
这个宾语sth.如果是不定式,或从句,则一定要将其后置,并用一个形式上的宾语it放在此处.
如：I have made it a rule to keep a diary every day.
本题后置的是一个名词性从句：that-从句.
不过,这一题,我感觉A选项也是可以的.有时候make sth.clear (/possible),这个sth.较长时,可以后置（而不需要形式宾语it),将make clear作为一个及物动词来看待一如make sure后跟that从句一样.这一题编者欠考虑.
下而是我从词霸摘的一些例句,这些例句来自互联网,可能不正规,供参考和讨论.
1.Please make clear that he should act so impolitely again.说明明白白地告诉他,他的举止不可以再这麽无礼.
2.The bloated numbers make clear that the production's target audience is not necessarily Chinese.组织者踌躇满志,明确表示演出的观众定位不一定非中国人不可.
3.However,I do want to make clear that I swore in frustration at the paparazzi's behaviour.然而,我希望表明我对狗仔队行为所带来的挫伤强烈的谴责.
4.Mr Rumsfeld did however make clear that the situation was always open to review.伦斯斐德解释说,伊拉克的情况美国一直都在关注考虑中.
5.Tax official :atfirst,you would better make clear that in whatform the equity arise?税务局:这要看所转让的股权是怎么形成的?
7.Make clear that you're familiar with the company or organization; your research will impress the employer.介绍你的长处和能力,证明你十分胜任这份工作,非常符合雇主的要求.