I don’t know             .
A what to do it   B how to do it C how to do  D what should I do
B

試題分析：疑問詞加不定式可以構(gòu)成不定式短語，在句子中充當(dāng)主語，賓語和表語。其中what在不定式中多充當(dāng)賓語，表語；how多充當(dāng)方式狀語。故選AC結(jié)構(gòu)有誤。賓語從句中的語序一般為陳述語序，故排除D。選B，我不知道怎樣做。
點評：此題題型的解答，一般可以通過分析不定式短語表達的含義和不定式的結(jié)構(gòu)上來進行區(qū)分。
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