[文法] 請求解釋文法題

[weepee (weepee)]

題目如下：

Stacy _____ Korean for 2 months last year

A. has studied

B. had studied

C. was studying

D. studied


答案是D @@

我選B

該怎麼解釋呢??  謝謝各位!!

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→ dunchee:http://ppt.cc/raVs  這是出題人的問題，B和D不應該同時出
→ dunchee:現
→ belovedrenee:我也是B