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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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