3、虚拟语气和情态动词

— David, we went to Lake Geneva for the weekend.

— That _______ a very nice change. I wish I had gone there.

A. must be B. must have been

C. could be D. could have been

【正确答案】B

【高考考点】考查情态动词。

【详细解析】must表推测，“肯定……”，must be表示对现在和将来事实的推测;must have been表示对过去事实的推测。这里表示一个肯定的推测，又因为是上个周末的事情，说明这件事情已经发生了，故选B;C选项could“可能”，表示轻微的怀疑或委婉的陈述看法，e.g. His story could be true, but I hardly think it is.他所说的这个故事可能是真的，但是我基本上不相信;D选项could have done是虚拟语气，表示“过去本能够做某事却未做”，e.g. You could have done better, but you didn’t try your best.你原本是可以做的更好的，但是你并没有尽自己最大的努力。