单项选择题

Jack ______ from home for two days now, and I am beginning to worry about his safety.

A．has been missing
B．has been missed
C．had been missing
D．was missed
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单项选择题
The board deemed it urgent that these files ______ right away.
A．had to be printed
B．should have been printed
C．must be printed
D．should be printed
单项选择题
The pollution question as well as other issues is going to be discussed when the Congress is in ______ again next spring.
A．assembly
B．session
C．conference
D．convention
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