题目内容
Tom stood there, ____ what he could do for the poor old man sitting beside him.
A. wondered B. wondering C. to wonder D. having wondered
B
解析:
考查区分谓语动词与非谓语动词的能力。并列谓语用谓语动词;对谓语动词进行修饰,用非谓语动词。wonder伴随谓语动词stood,因此wonder用分词形式作状语,
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