We didn’t know you were in trouble at that time we would have given you a hand.A. therefo

问题补充：

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

答案：

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。