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

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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