1.I didn't see Laura at the party last night.Do you know________?A.whyA.why didn’t she come B.what happened C.when would she arrive D.where she has been为什么不选D?

1.I didn't see Laura at the party last night.Do you know________?A.whyA.why didn’t she come B.what happened C.when would she arrive D.where she has been为什么不选D?
1.I didn't see Laura at the party last night.Do you know________?A.why
A.why didn’t she come B.what happened C.when would she arrive D.where she has been为什么不选D?

1.I didn't see Laura at the party last night.Do you know________?A.whyA.why didn’t she come B.what happened C.when would she arrive D.where she has been为什么不选D?
这是宾语从句,主句是一般现在时,理论上从句可以是任何时态.这里上文提到last night ,是个明显的过去时间状语,因而从句也用过去的某种时态为好.
可以改成 where she was ,也就是说 你知道“昨晚”她在哪吗?

B

我昨天晚上聚会的时候没看到劳拉。你知道（她）出什么事了吗？
按照人类思维来说，这种情况下不会问“谁谁谁去哪儿了”的。