题目内容

Hobo doesn’t know ____________ .
A．when to doB．what to doC．how to doD．where to do
B
对于特殊疑词后接动词不定式，一般而言疑问副词+to do（vt） sth，或疑问副词+to do(vi)或疑问代词+to do （vt）,或疑问代词+vi+介词。本题符合第三种情况，故选B
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