I didn't know you were in New York .how long--here A have yo

c 再问： why 再答： I didn't know you were in New York 。how long__here? A have you B were you C have you beenD will you come 应该选择C。 因为句子的意思是：我（之前）不知道你在纽约。你（现在）在这里多久了。 选项A的说法不对，比如“我在这里”不能说 I have here。 而是 I am here。 要用be动词。 选项B 是过去式，句意不通。 how long 是对一段时间的提问 是不可以用瞬间动词come 所以排除选项D。