求详解when（） properly,a reward system can help to increase stud

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求详解
when（） properly,a reward system can help to increase students'effort,attention and improve their behavior.
A using B to use C used D having used
为什么选B?
（）approximately eight by fourteen feet,this room can house6 to 8 students.
A Having measured B Being measured C Measuring D To measure
为什么选C?
能给我讲下这类题型要怎么做吗?

请认真阅读：
第一题的答案是C used.== when the system is used properly
在你的句子里面,when可以省略不用.used properly是分词结构做时间状语.
第二题的答案是C.在这里,measure是连系动词,没有被动语态.你的句子可以这样理
this room,which measures -- - - - ,can house 6 to 8 students.
在变回到你的句子结构就是：
this room,measurING-- - - - ,can house 6 to 8 students.-------就是说,measuring- - - 这一部分做定语,修饰this room.
再问：第一句为什么不可以这样理 when we using this system properly
第二句 to measure 为什么不可以前面加to　不是表目的吗？
再答： 1 when we use this system properly ------- 这样就对了，主将从现。
2 不是表目的的。measuring- ---是做定语，修饰this room的，做room的定语。定语前置。我的解答你carefully read一下。

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