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【单选题】
Although there is no life on Mars now , some scientists think that there some form of life a long time ago .A.
must be
B.
may have been
C.
can have been
D.
could be
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举一反三
【简答题】请简述可移动救生船内的应急设备。
【简答题】165x256=
【单选题】After the new equipment was introduced, they produced ______machines this year as the year before.
A.
as twice many
B.
as many twice
C.
twice as many
D.
twice many as
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