问题
单项选择题
Rescue workers continued the delicate task of sifting through tons of concrete and to try to reach possible survivors.
A. scraps B. leftoversC. debris D. residues
答案
参考答案：C
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Rescue workers continued the delicate task of sifting through tons of concrete and to try to reach possible survivors.
A. scraps B. leftoversC. debris D. residues
参考答案：C