The problem is ______ no one has this extraordinary skill.

The problem is ______ no one has this extraordinary skill.
A、that
B、where
C、which
D、as
【正确答案】：A
【题目解析】：本题考查表语从句。连接表语从句的连接词有:that，what,who,when,where，which,why，whether，how,whoever,whomever,whichever，whatever等，可排除D。ABC均符合语法，可是BC不符合题意，故选A。答案为A。