To make members of team perform better, the trainer first of all has to know their _____ and weaknesses.
A.strengths
B.benefits
C.techniques
D.abilities
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A解析名词辨析。strengths and weaknesses优缺点；benefit益处；technique技巧；ability能力句意：为了让队员们表现更好，训练师首先要知道他们的优缺点。