Icouldhaveofferedyousomehelplastweekend,butI

問題詳情：

 I could have offered you some help last weekend, but I _______ with my work at that time.

     A. would be occupied     B. was occupying   

     C. had been occupied      D. was occupied

【回答】

D

知識點：動詞

題型：選擇題