题目内容
（请给出正确答案）
[主观题]
There has been a nation—wide shortage of building materials，（）which the trade is
only just recove—ring．
A．for
B．on
C．at
D．from
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A．for
B．on
C．at
D．from
如果结果不匹配，请 联系老师 获取答案
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