英语：1.How is it _____he has made such rapid progress?

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英语：1.How is it _____he has made such rapid progress?
A.that B.why C.when D.the one
此题答案A,为什么不能选D?
2.The guide____they climbed the mountain was a very patient man.
A.under whom aid B.in whose aid C.with whose aid D.the aid of whom
此题答案C,为什么?怎么区分这4个答案?
3.Seeing someone in trouble,he always _____help to them.
A.provides B.supplies C.offers D.presents
这题答案C,为什么不选B?
4.The problem _____to be much more difficult than we had supposed.
A.proved B.turned C.was proved D.was turned out
此题答案A,为什么不能选C?
5.--Do you work hard at your lessons?
--Yes,I_____ no effort.
A.spend B.spare C.waste D.share
此题选B,这句话怎么翻译的呢?
下列溶液中Cl-浓度最大的是（）
A.200mL 2mol/L MgCl2溶液
B.1000mL 2.5mol/L NaCl溶液
C.250mL 1mol/L AlCl3溶液
D.300mL 5mol/L KClO3溶液
此题答案A,为什么不是D?
2.【标准状况下,11.2LSO3所含的分子数为0.5NA（阿伏加德罗常数）】这句话为什么不对?

1、这个应该还原一下,我觉得第一个词应该是what,还原之后为:it is what that has made him such rapid progress.这应该是个定语从句.
2、这道题也用还原法,还原之后为：The guide(they climbed the mountain with whose aid )was a very patient man.括号内是定语从句,修饰guide的,主句是括号外面的.定从中是说她们在导游的帮助下爬山.在某人的帮助下是with one's aid.
3、offer sth to sb .offer sb sth.offer有主动提供的意思.support sb.with sth.
4、记住prove证明,没有被动语态,和happen当发生讲一样,它们都是及物动词
及物动词无被动语态.
5、我没有分散任何精力或注意力
1、A：C=2*0.2*2=0.8 D：C=1*0.3*5=1.5 可是KClO3的clo3会点解成氯酸跟离子,到最后还是远远小于0.8的
2、SO3在标准状况下是固态.
(解答完毕,累死了……）

英语：1.How is it _____he has made such rapid progress? How is it （）he has made such rapid progress?A that Bwhy Cwh China has made such rapid progress是什么意思 he was hardworking ,( )he has made such rapid progress His diligence is ____he has made rapid progress china has made rapid progress的翻译名词性从句练习1.the reason he has made such great progress is _____ 语法练习1. the reason he has made such great progress is _____ h Has she made____ (rapid) progress in her study?It is a piece the reason why he has made such progress is that he has neve My cousin has made rapid progress in his studies this term,_ ____ the help of the teacher,Tom has made rapid progress ___