二、单项选择（共30题; 每题1分，满分30分）
A) 单项填空从A、B、C、D四个选项中，选出可以填在空白处的最佳选项，并在答题卡上将该项涂黑。
21. It’s nice you to help me with my English.
A. of B. for C. on D. in
22.The film for twenty minutes when they got to the cinema.
A. was begun B. had begun on C. has been on D. had been on
23. _________good advice! It’s so helpful to us.
A. How B. How a C. What D. What a
