_______ is important for us to learn English well.
A．WhatB．ThatC．ItD．Which
C

試題分析：考查it作形式主語。句子真正的主語是 to learn English well, 所以開頭用it來作形式主語。句意：對(duì)我們來說學(xué)好英語很重要。所以答案選C。
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