单项选择题

Astronomers at the University of California discovered one of the most distant ______

A．paradoxes
B．paradises
C．galaxies
D．shuttles
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单项选择题
He suggested that we put the scheme into effect, for it is quite______
A．probable
B．advisable
C．feasible
D．eligible
单项选择题
It is essential that these application forms ______ back as early as possible.
A．must be sent
B．will be sent
C．are sent
D．be sent
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