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
网友回答
A. would be occupied
B. was occupying
C. had been occupied
(答案→)D. was occupied
解析：考查时态：句意：上个周末，我本来可以帮助你的，但是当时我在忙于工作。从前面的句子可知是过去的虚拟，but后面是过去的事实，用一般过去式，be occupied in忙于，选D。