_______isveryimportantforusstudentstolearnEnglishwell.
A.ItB.AsC.WhatD.There在线课程A
解析：
考查it形式主语.本题的it是形式主语，真正的主语是后面的不定式to learn English well。在英语中能做形式主语或者形式宾语的只有it，故A正确。
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