从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. —How did you do on _____test?
—Well, actually you didn't do very well.I wonder if you had had ___ _good review of your lessons.
A. a;a B. the; the C. a;the D. the;a
22. 一When shall we restart our business?
一Not until we our plan.
A. will finish B. are finishing C. are to finish D. have finished
23. — Believe it or not, Tyler failed the final exams?
— ? What a pity!
A．Why not B．What for C．How come D．So what
