—“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 

B

解析試題分析：本題考察情態(tài)動詞用法，“情態(tài)動詞+have done”表示對過去情況的虛擬或者推測；wouldn’t have done本不會坐某事，實際上卻做了；must have done一定做了某事；根據(jù)句意可知本題是對現(xiàn)在情況的推測。句意：—Crash diets 讓我很快就減肥了，我很喜歡它�！清憻挄谩１揪涫褂脀ould對現(xiàn)在情況進行的說明。故B正確。
考點：考察情態(tài)動詞用法

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