29.That was really a splendid evening.It’s years ______ I enjoyed myself so much.
问题描述：
29.That was really a splendid evening.It’s years ______ I enjoyed myself so much.
A.when B.that C.before D.since
为什么是D不是C?
答
选择before主句时态不对;it's /has been years since +主语+did
it will be years before you attend the college entrance examination./it would be years before i enjoyed myself so much.
明白吗