_______forthefreeticket,Iwouldnothavegonetoseefilmsooften.
A、IfitisnotC
从本题后半句可以看出这是一个与过去事实相反的虚拟条件句， 从句中的动词要用 “had +过去分词”，如果将 if 省略，had 要位于主语之前，构成倒装句， 故本题的答案是 C。Had it not been for the free ticket =If it had not been for the free ticket 。
He talked a lot about things and persons ________they remembered in the school.
The other timing system belongs in our internal clocks，which，left ________，would tie the body to a 25-hour rhythm.
Thesyntacticrulesofanylanguageare______innumber.
Theothertimingsystembelongsinourinternalclocks，which，left________，wouldtiethebodytoa25-hourrhythm.
Country life is better than city life ________ it offers fresh air and noiseless environment
