We are very sorry for the delay in delivery and this _______ you some troubles in meeting orders of your customers.
A、may cause
B、must have caused
C、has caused
D、will be caused
【正确答案】：B
【题目解析】：【考点点击】本题在2005年4月真题第一大题 5小题考查过，主要考查的知识点为有关交货延 误的表达。【要点透析】本句是对某种事实的肯定推测， 要用must have done句型。故选B项。
