1、I'll never tell you another secret if you let this one( )

1、I'll never tell you another secret if you let this one( )
A off B out C away D on
2、The commander ( D ) the may closely before coming to the decision.
A investigated B inspected C researched D studied
3、Pick me up at 8 o'clock,I( D )my bath by then.
A may have B will be having C can have had D will have had
4、He asked( C )since he had been chairman for seven years.
A not to have been re-elected B to be not re-elected
C not to be re-elected D to have not been re-elected
5、The fire( D )in the furnace under the house.
A that they believe to start B that is believed to start
C they believe to have started D is believed to have started
6、I've already told you that I'm going to buy it,( C ).
A how much does it cost B however does it cost much
C however much it costs D no matter how it costs
7、I hope all the precautions against air pollution,( C )suggested by the local government,will be seriously considered here.
A while B after C as D since
8、It is reported that a series of meetings ( C )held about the best way to market the new product.
A has B have C was D were
9、( C )nothing more to discuss,the secretary-general got to his feet,said goodbye and left the room.
A There was B Being C There being D As there being
注：
1、这道题选什么及原因
2、research也是研究的意思啊,为什么不选C?
3、为什么选D?
4、为什么选C?
5、为什么选D?
6、为什么D不对?
7、为什么选C?
8、一系列的会是复数,谓语为什么选单数?还有为什么不用现在完成时?它也表示过去的事情啊.
9、句子不是过去时态吗,为什么不选A?为什么要用being?
除第1题外其它都有答案,解释选及不选的原因就行.

1.答案是B.let out 是泄露的意思
2.答案是D.看、查地图用study
3.答案是D.在这里要用将来完成时,表示在将来某个时间就完成的动作
4.答案是C.因为ask后跟动词的时候,要用动词不定式形式,并且elect和他的逻辑主语由被动关系,所以,用动词不定式的被动形式.
5.答案是D.我们知道这个句型；It is believed that .如果将这个句型中的that从句中的主语作为句子的主语的话,将变成句型：主语+be+believed to do.这句话的意思是：人们相信这场火是在房子下面的暖气锅炉里引起的.
6.答案是C.这是however引导的让步状语从句,语序要用陈述语气.如果要选D的话,要表达为；no matter how much.
7.答案是C.as是一个连词,引导的是方式状语从句.不过这是一个省略的一个结构.也就是我们常说的连词与分词连用,如果和句子的主语存在主动关系的话,用-ing分词；如果和他的逻辑主语存在被动关系的话,用-ed分词.
8.答案是C.a series of ...作主语常用单数.如果选A的话,要用被动形式,has been held.
9.答案是C.这是一个分词作状语的题目.我们知道,分词作状语时,分词的逻辑主语要和句子的主语一致.如果不一致的话,要加上它的自己的主语,构成了一个独立主格结构.如果要选A的话,前面要有连词.也就是As there was .,