The parents have devoted themselves to bringing up their children and now it is time for the children, , to show their devotion to their parents.
A. in their turn
B. in their return
C. in return
D. in their turns
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(答案→)A. in their turn
B. in their return
C. in return
D. in their turns
解析：考查固定搭配。In reurn作为回报；in turn轮流，反过来；句意：父母亲把所有的时间都花在了抚养孩子，现在反过来轮到孩子们表现出对父母的关心和爱护了。故A正确。