Sorry, I you here. How long have you been here? A.don't know; wereB.hadn't know;
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Sorry, I ________ you ________ here. How long have you been here?
A.don't know; were
B.hadn't know; are
C.haven't known; are
D.didn't know; were
试题答案
D
导解：我现在已经知道，所以本句中的“不知道”应发生在过去，故用一般过去时．