表操作共有3种视图，分别是设计视图、打印视图、【 】视图。
参考答案：版面预览
It just isn’t fair_____ I was working as a waiter last month; my friends were lying on the beach. .
A whenever B. though C. for D. while
水垢和水渣的形成是一个复杂的物力化学过程，这个过程分为哪几步？
A whenever B. though C. for D. while