1.( ) we stood at the top of the building,we were able to enjoy the town below clearly.A.As B.Although C.Unless D.Since请给我个理由,

1.( ) we stood at the top of the building,we were able to enjoy the town below clearly.A.As B.Although C.Unless D.Since请给我个理由,
1.( ) we stood at the top of the building,we were able to enjoy the town below clearly.
A.As B.Although C.Unless D.Since
请给我个理由,

1.( ) we stood at the top of the building,we were able to enjoy the town below clearly.A.As B.Although C.Unless D.Since请给我个理由,
B 和 C 意思不通顺.
“虽然我们站在楼顶,但是我们能清晰欣赏下面的小镇”
“如果我们不是站在楼顶,那么我们能清晰欣赏下面的小镇”
显然是意思是不通的.
since 和 as 在这里都可理解为 “因为”.
但 since 强调听话人也知道的理由,众所周知的理由.从这句话里,看不出听话人能在之前就知道了 “站在楼顶”这个理由.
而as表示原因,听话人并不提前知道.只是与 because相比,语气弱了些.但很适合用在这里.