Mr Smith has a lot of business. I know by that this man cannot be trusted. A. experience;

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A. experience; experience
B. experiences; experience
C. experience; experiences
D. experiences; experiences
解析：一词多义。Experience经验（不可数）；经历（可数）；by experience按照经验；结合句意可知A正确。句意：史密斯先生有很多的工作经验。按照经验来说这样的人不能被相信。