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

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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（）
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（）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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C ……不知道该做什么（或怎么做）
A跟B后面从语法角度上都要加it，因为do这里不能没有宾语，D的语序不对，he can就可以了

C 对，‘（不知道）做什么’
A中的WHEN 是副词，不能作宾语， B中的 DO 后缺少宾语；D 是语序错，应该是what he can do

选C

A不符合句意
B时态不对
D语序不对

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C 做什么
A 何时去做，1意思不对； 2 do没有宾语
B 他能怎么做， 1 时态不对 2 do没有宾语
C 他能做什么语序不对，宾语从句要用陈述语序，改成what he can do 才可以

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