单项选择题

________he arrived at the spot, he realized what had happened there.

A．The moment when
B．The moment
C．Until
D．At the moment
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单项选择题
________at from outer space, the Earth is just like a ball hanging in the universe.
A．Having looked
B．Looking
C．Looked
D．Having been looked
单项选择题
Most parents hope that their children will________their expectations.
A．live off
B．live with
C．live in
D．live up to
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