The teacher __ have thought Johnson was worth it or she wouldn't have wasted time on him, I suppose.

     A. should              B. can                C. would                  D. must

 

 

 

D

解析:考查情態(tài)動詞的用法。根據(jù)句意，“我猜想，老師原來一定認(rèn)為Johnson可以教化，否則她就不會在他身上浪費時間了�！� 故選D項，must have done sth.表示對過去發(fā)生的事情很肯定的推測。

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