We give dogs time, space and love we can spare, and , dogs give us their all.
A. in return
B. in all
C. in fact
D. in short
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(答案→)A. in return
B. in all
C. in fact
D. in short
解析：考察词组。In return 作为回报 in all 总计 in fact 实际上 in short简而言之
句意为，我们给予了狗时间，空间和爱，作为回报，狗给了我们它们的全部。