With his wife talking endlessly about his this and that, it is quite for him to lose his

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A. mon
(答案→)B. normal
C. ordinary
D. usual
解析：句意：因为他的妻子经常无休止地谈论这事那事，对他发脾气是很正常的事。mon一般解释为“平常的”，偶尔可表示“低劣的”，“粗俗的”。 mon强调许多事物具有某种共同点而“不足为奇”; general指普遍于大多数人或事物中,有“较少例外”的含义; normal形容人或物“符合常态或常规”; ordinary指与一般事物的性质标准相同,强调“平常”而无奇特之处。故选B。