The math problem is so hard. I really don’t know    .
A．how to do itB．how to doC．what to do itD．where to do it
A

試題分析：how如何，怎樣；what什么；where在哪兒。句意：這道數(shù)學(xué)題是這么難。我真的不知道如何解答。選項B缺少邏輯賓語，結(jié)合語境可知選A。
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