John, look at the time. ______ you play the piano at such a late hour ?
A．MustB．CanC．MayD．Need
B
此處考查情態(tài)動(dòng)詞表示推測(cè)的用法。should have done表示過(guò)去應(yīng)該做而實(shí)際并沒有做，因此淘汰A項(xiàng)。would不用來(lái)表推測(cè)，因此淘汰C項(xiàng)。B基與D項(xiàng)雖然都可以表示推測(cè)，但B項(xiàng)表肯定意義而D項(xiàng)表示否定推測(cè)，意為“不可能”，根據(jù)句意：他肯定已完成了他的工作；不然，他就不會(huì)在海邊玩得那么愉快了。可知此處需要肯定意義，因此淘汰D項(xiàng)。
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