【题目】The Greens’ travel to India ________ enjoyable but Mrs. Green was too particular about the accommodation.
A.could beB.should beC.must have beenD.could have been
在线课程【答案】D
【解析】
考查虚拟语气。句意：格林一家去印度的旅行本可以很享受的，但格林女士对住宿太挑剔了。本句运用了虚拟语气，表示本可以做某事（而未做成），其固定用法是could have done。故选D项。