-Did you reach the US the next day? - No. Somehow . it was three days I arrived there.A.

问题补充：

-Did you reach the US the next day?

- No. Somehow . it was three days I arrived there.

A. since

B. when

C. that

D. before

答案：

A. since

B. when

C. that

(答案→)D. before

解析：句意：第二天你到了美国吗？--不，不知怎么的三天后我才到那里。这里使用了固定句型：It was+一段时间+before+从句，“过了多久才…”，since也可以和一段时间连用，但是句型是：It is/has been+一段时间+since，所以选D。