There ________ be any difficulty in passing the final examination since you have made enough preparations in the training courses．

A.needn't

B.shouldn't

C.mustn't

D.shan't

答案及解析： B

解析：

句中since状语从句提示，空缺处是表示推测的情态动词，而四个选项中，能表示推测的情态动词只有should和must，但must通常用在肯定的陈述句中，在否定句或疑问句中要换用can或could，故最佳答案是B，作“不应该”解。