单选题：根据以下材料，回答题。A．for stone to use in modern buildingsB．has made

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根据以下材料，回答题。

A．for stone to use in modern 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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