单选题：回答(49)题

题目分类：理工类
题目类型：单选题
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回答(49)题 A．for stone to use in modem buildings
B．has made them less likely to fall into ruin
C．before they could begin to build
D．because the plans of other large works have fortunately been preserved
E．while building the pyramids
F．they will continue to stand for thousands of years yet

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