题目

Jane doesn't know how she can improve her Chinese.（用动词不定式to do改写下列句子）Jane doesn't know improve her Chinese. 答案：【1】how toIt was the four years from 2004-2007, _____ I spent studying for a master's degree, _____ I will never forget. [     ]A. when; that B. when; whenC. that; that D. which; that