第一节 单项填空(共15小题;每小题1分,满分15分)
请从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。
例:A computer can only do ______ you have instructed it to do.
A. how B. after C. what D. when
答案是C.
21.-I just received a letter from one of my old school friends.
-______
请从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。
例:A computer can only do ______ you have instructed it to do.
A. how B. after C. what D. when
答案是C.
21.-I just received a letter from one of my old school friends.
-______