I you in London．How long here?( )A．don't know,are,had you beenB．didn't know,were,have you beenC．didn't know,are,have you comeD．don't know,were,are you 题目和参考答案——青夏教育精英家教网——

题目内容

2．I you in London．How long here？（　　）

	A．	don't know；are；had you been		B．	didn't know；were；have you been
	C．	didn't know；are；have you come		D．	don't know；were；are you

分析我不知道你在伦敦，你在伦敦多久了？

解答答案：B．
宾语从句中的时态要和主句保持一致，如果主句用了一般过去时，那么从句就要用过去时的某种时态，根据"I you in London．"我不知道你在伦敦，可知在说这句话之前的时候不知道你在伦敦，也就是在过去的时候不知道，所以要用一般过去时，主句用了一般过去时，从句也要用一般过去时，另外根据"How long here"可知从过去某时刻开始就在伦敦，一直待到说话发生的时候，还有可能延续下去，所以要用现在完成时，综上所述，故选B．

点评首先要掌握宾语从句的时态要和主句的时态保持一直，还要掌握现在完成时的用法，然后结合具体的题目，就可以确定正确答案．

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