单项选择题

The contract is ______ unless it is officially stamped.

A．invalid
B．invaluable
C．precious
D．deliberate
<上一题 目录 下一题>
热门 试题

单项选择题
The brave firemen had fought for days before they managed to ______ the forest fire.
A．put on
B．put up with
C．put off
D．put out
单项选择题
The idea of being evaluated by ______ makes some managers uneasy.
A．substance
B．subsidy
C．subordinates
D．subsequence
相关试题