If the Watergate Incident__________Nixon would not have resigned from the presidency.?
A．did not occurB．had not occurred
C．was not occurringD．be circling
B?
had not occurred表示對過去的虛擬，條件句中要用過去完成時(shí)，主句中要用should(would，could，might)+動(dòng)詞原形。?
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