He has been told many times that his casual clothes are not for some formal occasions．
A. innocent
B. appropriate
C. temporary
D. cautious
网友回答
A. innocent
(答案→)B. appropriate
C. temporary
D. cautious
解析：词义辨析。Innocent无辜的；appropriate 适当的；temporary临时的；cautious谨慎的。句意：已经告诉过他多次了，他的便服不适合一些正式场合。故选Ｂ。