Pawel Abbott then netted a 74th-minute winner for the visitors, with the Daggers screaming for an offside flag.
A frustrated Strevens said: "I think we've been beaten by a couple of dodgy decisions.
"We're very disappointed because we're not one of the so-called bigger teams in the league and a number of decisions in recent games have gone against us.
"On another day, we get those decisions for us and 'Benno' scores, while in real time, their goal looked two or three yards offside to me.
"At this level, one little mistake like that and it costs you the game."