He _____ have finished his work; otherwise, he wouldn’t be enjoying himself by the seaside.
A．shouldB．must C．need D．can
B
本題考查aux. v+have +done的用法。must have done表示對過去發(fā)生的動作最有把握的猜測，意思是“一定做過某事”， 本題考查“must +have + －ed”結(jié)構(gòu)表示對過去的肯定推測用法。句意為：他一定是完成了工作，否則，他不會在海邊玩的這么開心。而“should + have+－ed”則表示應(yīng)該做某事卻沒做；“can/need+ have +－ed”不用在肯定句中。故B正確。
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