I was too busy at that time, I would have given you a hand.
A. even though
B. so
C. otherwise
D. nevertheless
网友回答
A. even though
B. so
(答案→)C. otherwise
D. nevertheless
解析：考查状语从句。句意为“我那时太忙了，要不然的话我就会帮你的忙了。”otherwise意为“要不然”；even though 表示“即使”、“尽管”... ；so“因此”，表示结果；therefore表因果关系。