单项选择题

The contract is ______ unless it is officially stamped.

A．invalid
B．invaluable
C．precious
D．deliberate
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单项选择题
Like some foreigners, I ask a lot of questions, some of which are insultingly silly. But everyone I ______ has answered those questions with patience and honesty.
A．come across
B．come by
C．come over
D．come into
单项选择题
The idea of being evaluated by ______ makes some managers uneasy.
A．substance
B．subsidy
C．subordinates
D．subsequence
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