1.There have been ten thousand visitors to the exhibition si

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1.There have been ten thousand visitors to the exhibition since(its opening)请问since后不是用过去时吗,还有与it's opening的区别 2.The radio made in our factory are better than (those)made in theirs请问that what that one 为何不可?

1.There have been ten thousand visitors to the exhibition since(its opening)请问since后不是用过去时吗,还有与it's opening的区别
答：since可以作介词,后跟名词如：since 1997.
这里的its opening 中的opening是动名词,its不是it's(=is),和his一样,是形容词性的物主代词.
since its opening 自从（它的）开张以来.相当于since it opened.这里的since才是连词,引导时间状语从句.
it's opening= it is opening “它正在打开”,是现在进行时.
2.The radios made in our factory are better than (those)made in theirs请问that what,that,one 为何不可?
答:你的radio少加了个S,从谓语动词are可以判断出来,这是复数名词之间的比较.
我厂生产的收音机（复数,不止一台）比他们厂生产的那些（those=the radios)更好.
that,one都是单数.选项中还有一个that what项吗?明显的凑数项,最不可能的,你都不能排除?

there are ____ of visitors in the exhibition every week. 新概念问题：1.Visitors have been asked to keep the woods clean and Visitors have been asked to keep the woods clean and tidy. Visitors have been asked to keep the woods clean ad tidy汉语的意 Visitors have been asked to keep the woods clean and tidy I have been in Harbin for ten months.I() the weather there.A There have been many changes__in my hometown in the last ten Though __ of danger ,sightseers have been flocking to the si The business done this month amounts to ten thousand dollars There have been several new events __added____ to the progra have been there 还是 have been to there ten signs have been voted the hang gestures most likely to i