第二部分英语知识运用（共两节，满分45分）
第一节单选填空（共15 小题，每小题1分，满分15分）
从A、Ｂ、Ｃ、Ｄ四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该选项涂黑。
21. Sam has been appointed _____ manager of the engineering department to take ____ place of George.
A. 不填；不填 B. the; 不填 C. the; a D. 不填；the
22. I will have my house _____ this weekend. If it is convenient to you, please come to help me.
A．painting B．painted C．to paint D．paint
23. Was it because your car broke down halfway ____ you were late for the important meeting yesterday?
A．why B．where C．that D．what
24. Only after they had performed hundreds of experiments _____ in solving the problem.
