问题补充：
单选题SATtestsyourabilitytoidentifymainandsupportingpointsandalso______betweenthem.A.differentiatesB.differentiateC.differentiatingD.to differentiate
答案：
D解析考查非谓语动词，此处是省略结构，完整为……and also your ability to differentiate between them.
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