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Tom's dog is ill.He looks worried and doesn't know()

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Tom's dog is ill.He looks worried and doesn't know()
a.when to do b.how he could do c.what to do d.what can he do
Tom's dog is ill.He looks worried and doesn't know()
C

括号中翻译为“他能干什么”,直译是what can he do,但是这里是从句,所以要用陈述句语气(what he can do),前面有了主语he,可以简写为what to do,这里的to do 是非谓语动词.

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