. The teacher __________ have thought Johnson was worth it or she wouldn’t have wasted time on him, I suppose.
A．shouldB．can
C．wouldD．must
D。
“must+have+過去分詞”表示對(duì)過去情況的肯定推測。句意為：我想，老師一定認(rèn)為約翰遜是值得教的，要不然她就不會(huì)在他身上浪費(fèi)時(shí)間了。
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