听力原文：How long have you been working for JCR？（A) Since 1994.（B) Until the end of this w

How long have you been looking for a position？你花了多长时间寻找自己的位置？

听力原文：M: Now, then, Mrs. Darcy. How long has this tooth been giving you trouble？W: Well

听力原文：M: Now, then, Mrs. Darcy. How long has this tooth been giving you trouble？W: Well

听力原文：M: How long can I keep the book？W: Three weeks, but you can renew it if you need

听力原文：How long did you live in Seattle of the United States？（A) It is a beautiful city

How long have you been _（) on board？A.workingB.makingC.acting