Hobo doesn’t know ____________ .
A．when to doB．what to doC．how to doD．where to do
B
對(duì)于特殊疑詞后接動(dòng)詞不定式，一般而言疑問副詞+to do（vt） sth，或疑問副詞+to do(vi)或疑問代詞+to do （vt）,或疑問代詞+vi+介詞。本題符合第三種情況，故選B
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