“Hello! I ____________ you ____________ in London. How long have you been here?”
A、don’t know; were
B、hadn’t known; are
C、haven’t known; are
D、didn’t know; were
【正确答案】：D
【题目解析】：how long have you been here?译为：你已经在伦敦（here）住了多久?have been 现在完成时是指：从过去的某一段时间到现在,been表延续性所以要用didn't know; were,译为：我不知道你在伦敦（语境是过去的某段时间一直不知道）
