I didn't like Tom,who__those in trouble without giving a hand to them.

问题描述:

I didn't like Tom,who__those in trouble without giving a hand to them.
A.always laughs at
B.was always laughing at
答案是选第二个,我选的是第一个,请教各位高手为什么不能用现在时态?

因为主句是didn't,是过去式,从句要和主句保持统一.
另外,进行时态含有抱怨的意思