— You speak French so well. How long have you learned it? 
— ________ I was fifteen.
A．UntilB．SinceC．When D．Before
B
since +一般過去時(shí)，相當(dāng)于用延續(xù)性動(dòng)詞，how long應(yīng)該與延續(xù)性動(dòng)詞連用，故選答案為B
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