--Your Japanese is so good. How long have you been in Japan?-- I was five.A. SinceB. Befo

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(答案→)A. Since
B. Before
C. Until
D. When
解析：Since自从……以来；Before 在……之前；Until直到；When当……时。句意：你的日语这么好。你在日本多久了？结合语境可知选A，自从我五岁以来。