题干
I know ________ I promised to take you to dinner, but I won't finish working until ten o'clock.
A：that
B：if
C：what
D：why
答案(点此获取答案解析）
A
I know ________ I promised to take you to dinner, but I won't finish working until ten o'clock.
A：that
B：if
C：what
D：why
