The poor child stood there, and ________ what to do, turned to his father for help.   
A．not knowingB．not knewC．not to knowD．not know
A

試題分析：考查非謂語動詞。從第一個逗號起，分為兩個分局，第二個分句包含一個非謂語動詞短語“________ what to do,”，不小心的話，會受到and的影響而誤選B。Know與the poor child是主謂關(guān)系，一個使用現(xiàn)在分詞表主動和伴隨狀況，故選A。
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