题目内容
If the Watergate Incident__________Nixon would not have resigned from the presidency.?
| A.did not occur | B.had not occurred |
| C.was not occurring | D.be circling |
B?
had not occurred表示对过去的虚拟,条件句中要用过去完成时,主句中要用should(would,could,might)+动词原形。?
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