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【参考答案】

obvious problems/clear problems/problems
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A．They are still very safe.B．They have been rescued by the US army.C．They have been killed.D．Nobody knows exactly what has happened to them.
A．They are still very safe.
B．They have been rescued by the US army.
C．They have been killed.
D．Nobody knows exactly what has happened to them.
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∧the
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