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
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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
单项选择题
The tragedy of the Challenger ______ an ongoing controversy on all aspects of America's space program.
A．arose
B．ignited
C．resulted
D．started
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