Mr Green always --weekend piaying with his children

选A.
spend weekend doing sth.可以说是固定搭配,就是说某人周末怎么过,通常周末都做些什么.
也可以说 I spent my summer holiday learning to swim.我这个暑假学游泳来着.不用take.
cost 是专门形容花费了多少钱的.而take也是专门说花了多少时间的,而不是如何,怎么度过那段时间的.