问题描述：
David has made great progress recently.（）,and（）.ASo he was;so you haveBSo he was;so have yo...
David has made great progress recently.
（）,and（）.ASo he was;so you haveBSo he was;so have youCSo has he;so have youDSo has he;so you have为什么选B不选C?
David has made great progress recently.
（）,and（）.ASo he was;so you haveBSo he was;so have youCSo has he;so have youDSo has he;so you have为什么选B不选C?
问题解答：
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