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单项选择题
A．Their being built up of stones.B．The shape of the pyramids.C．People’s taking good care of them.D．Effective measures to protect them.
A．Their being built up of stones.
B．The shape of the pyramids.
C．People’s taking good care of them.
D．Effective measures to protect them.
单项选择题
A．Write a report.B．Join his friends.C．Go to the laboratory.D．Go to the party.
A．Write a report.
B．Join his friends.
C．Go to the laboratory.
D．Go to the party.
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