第二部分：英语知识运用（共两节，满分45分）
第一节：单项填空：
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。共15小题；每小题1分，满分15分。
21．—What did Mr Smith do in the middle of the night?
—Well, I'm not sure, but he was often heard ___________.
A．singing the same song B．to sing the same song
C．sing a same song D．to be playing same song
22．The number of registered participants in this year’s marathon was half .
A. that of last year’s B. those of last year’s
C. those of last year D. of last year’s
