—“Crash diets” make us lose weight fast and I am all into that.
—But it better to work out.
A. had
B. would be
C. wouldn’t have been
D. must have been
网友回答
A. had
(答案→)B. would be
C. wouldn’t have been
D. must have been
解析：本题考察情态动词用法，“情态动词+have done”表示对过去情况的虚拟或者推测；wouldn’t have done本不会坐某事，实际上却做了；must have done一定做了某事；根据句意可知本题是对现在情况的推测。句意：—Crash diets 让我很快就减肥了，我很喜欢它。—但是锻炼会更好。本句使用would对现在情况进行的说明。故B正确。