题目内容

Yesterday（昨天） he lost     .
A．a set of keysB．a set of keyC．two keyD．a set keys
A

试题分析：a set of一套，一组，后面名词用复数； two两个，后面名词用复数。句意：昨天他丢了……。结合语境可知本句中key应该用名词，选A。
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