1-David has made great progess recently -,and A.So he ha

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1-David has made great progess recently -__,and __A.So he has;so you are B.so he has ;so have y
1-David has made great progess recently
-__,and __A.So he has;so you are B.so he has ;so have youC.so has he;so have youD.so has he;so you have求解释,另外2、The maths problem is to difficult for me to work (it) out要用it么

1.第一个表示他确实是这样,第二个表示你也像他一样有很大进步.
2.不用it肯定对.用了it肯定不好,有可能不对.还是不用好.

1-David has made great progess recently -__,and __A.So he ha David has made great progress recently "so he has and so hav David has made great progress recently "___and ___" A:so he David has made great progress recently.____,and _____.A.So h so的倒装“David has made great progress recently.” “____and_____ David has made great progress recently.（）,and（）.ASo he was;s David has made great progress recently.—_______,and _______. -I think he has made great progess in English .A So he has B --------David has made great progress recently.------------_ —David has made great progress recently. such great progess has the country made Bruce has made great progress recently.____and____.A.So he h