It worried me that the letter had not arrived

来源：百度知道 编辑：UC知道 时间：2024/05/24 23:02:38
It worried me that the letter had not arrived,especially ______ this had never happened before.

A.as
B.that
C.though
D.even

信件还没收到，我很担心，尤其是这种情况以前从没发生过。
所以选择A，因为像这样的情况

C.
根据题意
前后为让步关系.

我上午考试选的是A.
as是因为,由于的意思.
especially as...尤其是因为...

A