It will be quite a long time she is back again, so don’t be too cross with her.
A. that
B. since
C. before
D. until
网友回答
A. that
B. since
(答案→)C. before
D. until
解析：此题考查连词的用法。It is + 时段 + since / before / that...，用that则构成强调结构，since表示”自从……以来”，before”在……之前”，此句意思是”很久之后才回来，所以别对她发火”。