问题
选择题
He has been told many times that his casual clothes are not ____ for some formal occasions．
A．innocent
B．appropriate
C．temporary
D．cautious
答案
答案：B
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。