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

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

选项 A、for
B、on
C、at
D、from

答案D

解析 本句翻译为“贸易的复苏造成了全国性的建筑材料短缺。”
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