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A．The announcer should try not to sound nervous.B．The woman should not be nervous.C．The plane will arrive at 9:20.D．The woman should get on the plane.
A．The announcer should try not to sound nervous.
B．The woman should not be nervous.
C．The plane will arrive at 9:20.
D．The woman should get on the plane.
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The central heating system has proved__________________(没最初期望的那么有效)
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