单项选择题

Just as the soil is part of the earth, ______ the atmosphere.

A．as it is
B．the same is
C．so is
D．and so is
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单项选择题
Children are ______ to have some accidents as they grow up.
A．obvious
B．indispensable
C．bound
D．doubtless
单项选择题
A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.
A．before
B．until
C．since
D．when
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