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
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单项选择题
More than one car________in the traffic accident leading to the tragic death of Princess Dian
A． was involvedB. were involvedC. has involvedD. have been involved
单项选择题
________, he was fully aware of its importance.
A．A child as he was
B．Child as he was
C．Child although he was
D．A child though he was
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