The math problem is so hard. I really don’t know    .

A.how to do it B.how to do C.what to do it D.where to do it

A

解析試題分析: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。
考點:考查疑問詞+不定式短語。

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