__________ the reason , research shows that laughter is good for your health.
A．WhateverB．WheneverC．WhicheverD．However
A

試題分析：
根據(jù)句意：研究人員發(fā)現(xiàn)，不管什么原因，笑都有利于你的健康。
Whatever無論什么  whenever無論何時  whichever無論哪一個  however無論怎樣
故選A
點(diǎn)評：whatever =" no" matter what .whichever同理，需要注意的是whatever既可引導(dǎo)名詞性從句在句中充當(dāng)成分，又可引導(dǎo)讓步狀語從句，而no matter what只可引導(dǎo)讓步狀語從句。
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