I don't know what I should do to help him.
A. how to do           B. what to do         C. what to do it
B

試題分析：句意：我不知道我能幫助他做些什么？分析：how to do錯(cuò)誤選項(xiàng)（正確形式應(yīng)為how to do it ); what to do 做什么；what to do it錯(cuò)誤選項(xiàng)（正確形式應(yīng)為what to do ). 考查賓語從句的特殊形式，從句中的主語和助動(dòng)詞省略，可將其轉(zhuǎn)換為小品詞to.故選 B
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