(单选题)

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A.keeping

B.making

C.letting

D.asking

参考答案：D

参考解析：

考查动词辨析。句意：因此，珀斯西澳大利亚大学和墨尔本大学的研究人员决定通过让双胞胎一起锻炼，来研究运动反应的变异和遗传。keeping意为“保存，保藏，保管，保守”；making意为“使”；letting意为“让”；asking意为“邀请，要求”。根据后面的宾语补足语“to work out together”可知，此处只能填入asking，只有ask后接动词不定式充当宾语补足语。故选D。

知识点：

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