08年高中阶段教育学校招生统一考试英语卷
从每小题所给的A、B、C、D四个选项中选出可以填入空白处的最佳答案。
21.---What was Marc doing when his mother got home yesterday ?
----He was playing _____________ guitar.
A. the B. a C. an D. /
22.---When did the great earthquake in Wenchuan happen ?