It was strange that he have uttered such rude remarks on that occasion.
A. must
B. could
C. should
D. would
网友回答
A. must
B. could
(答案→)C. should
D. would
解析：考查虚拟语气。句意：很奇怪那个时候他能够说出如此粗鲁的话。本句表达否定含义，“should+have+done”意思是“本来应该做某事，而实际没做。” It was strange表达否定含义，表示本来不应该做某事，而实际做了。含有指责对方或自责的含意。故选C。