四个选项意思相近
A选项表达的是我现在不知道你在伦敦,但是其实我已经知道了,而且第二个动词也不对应
B选项是过去完成时,这个是很少用的,因为过去完成时出现的前提是要有过去的时间段
C选项,完成时除了表示完成外还隐含对现在的影响,但句意只是要表达我不知道你在伦敦,并没有提及对现在的影响
"Hello!I ____you ___in London.How long have you been here?"
5个回答
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