It was not until the results were announced（ ）she realized she had made a silly mistake.
A、
which
B、
that
C、
what
D、
who
【正确答案】：B
【题目解析】：
本题考查涉及until的强调句的固定用法。
It is/was not until…that…是强调句的固定用法意为“直到…，才…”，此句对应的非强调句为She didn't realize she had made a silly mistake until the results were announced.空缺处连接词应使用that，故选B。
句意：直到结果公布，她才意识到自己犯了一个愚蠢的错误。