We're not very close friends__we've known each other for a long time.这里是用although 还是until

We're not very close friends__we've known each other for a long time.这里是用although 还是until

although
这句话的意思是：我们不是很要好的朋友-----我们认识很久了
所以横线部分因该是 ：虽然--although

although，如果用until应该改成“we'll not be very close friends until we know each other for a long time.”如果要表达“除非”的意思的话，应填unless，也不是until。

Until 这是not...until 的一般句式