---HowlonghasZhangZiyibeenanactress？---2000，whenshegraduatedfromcollege．（）A.AfterB.InC.ForD.Since
---How long has Zhang Ziyi been an actress？
---_______ 2000，when she graduated from college．（ ）
A. After
B. In
C. For
D. Since
根据问句用的是how long"多长时间"，在结合问句是现在完成时，判断答语应该是表示时间段的短语，Since+时间点，表示"自从…"表达的是时间段，用于现在完成时，故选D
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