Our country is now quite different( ) it used to be.A from what Bfrom which Cfrom that D where 解释下为什么选A 这句子是什么句子 另外意思也表诉下谢谢

The population of our country is now more than three times what为什么用what now our country is becoming more and more strong 这句话错在哪? Our country is very big. ````宾语重句!``1.our classroom is clean.their classroom is very clean.their classroom is____ ____our.2.our country is beautiful.it will be more beautiful in the future.our country will be____ ____in the future____in ie now. Tom is now living in _____European country in my country it is now night, We are now b__ our country at high speed We are making our country ___(beauty)now.【可以填多个词】 where is our country's capital Our country is getting more and more__? Our country is getting stronger and stronger our country is great什么意思 our country is short of energy Shanghai is()the east of our country Our country’s economy is i rapidly. our country is large改为感叹句 he is the chairman of our country 同义句he is（ ） （ ） （ ）our country Are there mountains in our country?IS there a beach in our country?