题目内容：

A new bike was bought for him 还是 has been bought for him after he entered
the senior middle school.

优质解答

A new bike was bought for him for him after he entered.
Buy作为瞬间动词只能用过去式.另外为了前后一致,后面"after he entered the senior middle school."是过去式,所以前面一定要是过去式.