Joanna her QQ yesterday.or she would have come to the party last night．( )A．mustn't have openedB．shouldn't have openedC．couldn't have openedD．needn't have opened 题目和参考答案——青夏教育精英家教网——

题目内容

17．Joanna______________her QQ yesterday，or she would have come to the party last night．（　　）

	A．	mustn't have opened		B．	shouldn't have opened
	C．	couldn't have opened		D．	needn't have opened

分析乔安娜昨天不可能上了QQ，要不然她昨晚会来参加聚会的．

解答答案：C
题干中or要不然，否则，表示对前面的某种情况很肯定；she would have come to the party last night对过去情况的虚拟，说明她没来参加聚会；可以知道她昨天不可能上了QQ．故选C．

点评情态动词的用法是英语中常考的语言点．通常考查的方式有虚拟和推测，本题考查的是情态动词对过去情况的肯定推测．

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