---“Crash diets” make us lose weight fast and I am all into that.
--- But it_______better to work out. A.hadB.would beC.wouldn’t have beenD.must have been
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B解析试题分析：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。
考点：考察情态动词用法