单项选择题

Some people consider ______ cruel to send animals in rockets into space.

A．that is
B．it being
C．it be
D．it
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单项选择题
These questions ______ in English.
A．must answer
B．should answer
C．must be answered
C．can answer
单项选择题
______ his work, he would do it till it was finished.
A．Once Tom would start
B．Once Tom started
C．Since Tom would start
D．Since Tom started
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