第一节:单项填空(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的标号涂黑。
21. Some of the
exercises appear to be
ones that you have done, but after taking
second look, you will find that they are different.
A. 不填; the B.
the; the C.
the; a D.
the; 不填