The pills       him.If only he had taken them regularly.
A．could helpB．may help
C．must have helpedD．might have helped
D
考查情態(tài)動(dòng)詞用法。意為要是他經(jīng)常服藥，那些藥本可能有他有幫助。 根據(jù)if only he had taken 可知，是對(duì)過(guò)去的虛擬，所以排除A，B. 而C意為一定做了某事，不符合題意
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