行前说明会的后期补救工作主要包括()。
A、给未出席的游客留下联系方式
B、给未出席的游客打电话
C、给未出席的游客发放相应物品
D、给未出席的游客送机(车、船)票
参考答案:B, C
Peter hurried through dinner, changed into old clothes, _______ in the lab for three hours.
A.worked
B.working
C.and worked
D.to work
— _____ color is Mary's ruler?
— It's red. [ ]
A. What
B. How
C. Who
D. What's