推 elelith:因為"現在"完成式 他去美國的動作已經結束了所以是過去式 09/15 13:56
推 cloud7556:現在完成式三種用法：完成／經驗／持續 09/16 10:04
→ cloud7556:題目很明顯告訴你been there "once"表經驗，動作結束 09/16 10:05
A: Has John ever been to the USA?
B: Yes, he's been there once. ____________
(A) He's been there for a week.
(B) He went there this spring.
答案是B
想問A 他在那裏待了一禮拜 為什麼不行呢?
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