【B3】
A. would have left
B. have left
C. could have left
D. to take it out
某校将全体学生分成两批,一批上午在教室里上课,另一批上午在学校的图书馆、体育馆、工厂、商店等场所进行有组织的活动,下午对调。这种做法属于()
A. 二部制
B. 工读制
C. 复式教学
D. 合作教学
【B18】
A. missed
B. missing
C. having missed
D. miss
【B4】
A. taking it out
B. to take it out
C. taken out it
D. had forgot