We should whatever is true.A. keep upB. settle downC. stick toD. team up with

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A. keep up
B. settle down
(答案→)C. stick to
D. team up with
解析：考查词组：A. keep up 维持，不低落B. settle down定居下来C. stick to坚持D. team up with与…合作配合，句意：我们应该坚持对的事情。选C。