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        1. Hobo doesn’t know ____________ .
          A.when to doB.what to doC.how to doD.where to do
          B
          對于特殊疑詞后接動詞不定式,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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