英文兩題 - 考試

David ____ , but he choose to stay and fight

(A)couldn't have escaped (B)could have escaped
(C)hadn't escaped (D)can escape

答案是(C)
(A)是錯在文法還是文義呢@@

I ____ some evening classes this semester , and I have a lot of
homework
(A)am taking (B)had taken (C) take (D)was taking
答案是(A)
為何用進行式呢??我在這學期正在選早上的課???
(B)哪裡錯了呢@@

懇請大大門解惑^ ^~~

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