The boy could ________ the street by himself.

问题描述:

The boy could ________ the street by himself.
A.cross
B.crossing
c.crosses
d.to cross

cross,could后面要跟正常形式.我记得我们老师说could不一定是can的过去式诶但是一般情况下,could后面要不就是跟have,要不就是动词原形。好吧我选错了最后知道真相的我眼泪掉下来! thank you very much!以后有问题来我们团队求助:英语人工翻译队