________ the reason, it is for sure that yawning can be passed from person to person.
A．WhateverB．WhereverC．WhicheverD．However
A
考察從句連詞選擇。Whatever無論什么 ，用語名詞前，wherever無論何地，作地點狀語 whichever無論哪一個，用于有范圍的時候  however無論多么，用語形容詞前
句意為，無論是什么原因，可以肯定的是打哈欠是可以從一個人傳染到另一個人的。
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