He           have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.
A．shouldB．mustC．wouldn’tD．can’t
B
由句意  “他一定是已經(jīng)完成工作了；否則, 他就不會在海邊玩得那么高興�！笨芍菍^去發(fā)生事情的肯定推測。
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