We didn’t know you were in trouble at that time, we would have given you a hand.
A. therefore
B. however
C. otherwise
D. though
网友回答
A. therefore
B. however
(答案→)C. otherwise
D. though
解析：副词辨析。A因此；B然而；C否则，要不然；D尽管；句意：我们不知道在那时你遇见了麻烦。要不然，我们就会帮助你的。根据句意说明C正确。