--- You speak French so well. How long have you learned it? 
--- ______ I was fifteen.


  1. A.
    Until
  2. B.
    Since
  3. C.
    When
  4. D.
    Before
B
since +一般過去時，相當于用延續(xù)性動詞，how long應該與延續(xù)性動詞連用，故選答案為B
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根據(jù)下列短文內容，選擇最佳答案。

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(1)

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[　　]

A．

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B．

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