There has been a nation-wide shortage of building materials, (     )which the trade is only just recovering.

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问题 There has been a nation-wide shortage of building materials, (     )which the trade is only just recovering.

选项 A、for
B、on
C、at
D、from

答案D

解析 本句翻译为“全国性的建筑材料短缺是由于贸易的刚刚复苏。”
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