【題目】I don't know ________.

A. how can I do it

B. how to do it

C. what can I do

D. how to do

【答案】B

【解析】試題分析：句意：我不知道怎樣做。A和C是賓語從句，從句中應(yīng)使用陳述語序，故這兩個選項不對；D選項中缺少賓語，不能用疑問詞how，故選B。

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