基本信息
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。 1. —why didn’t you response to their greeting? —sorry. i ______they ______ to me. a. don’t realize; are waving b. don’t realize; were waving c. didn’t realize; were waving d. didn’t realize; are waving
