There ________ be any difficulty in passing the final examination since you have made enough preparations in the training courses．
A.needn'tB.shouldn'tC.mustn'tD.shan't在线课程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。