I saw her in the office this morning．She back to work without the doctor's permission．( )A．couldn't comeB．couldn't have comeC．should have comeD．should not have come 题目和参考答案——青夏教育精英家教网—

3．I saw her in the office this morning．She _______ back to work without the doctor's permission．（　　）

	A．	couldn't come		B．	couldn't have come
	C．	should have come		D．	should not have come

分析我今天早晨看见她在办公室．她本不应该未经医生许可就回去工作．

解答答案是D．本题考查"情态动词+have done"的结构．英语中对过去的或已经发生的事件的说明用"情态动词+have done"的结构，故排除A；couldn't have done表示"不可能已经…"；should have done是虚拟语气，表示"本应做但事实上却没有做"；should not have done是虚拟语气，表示"本不应该做但事实上却做了"；根据句意可知，"她本不应该未经医生许可就回去工作"判断答案选择D．

点评在掌握虚拟语气的规则的基础上，判断题干属于什么类型的虚拟，然后根据语境，选用恰当的动词形式表达虚拟．

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