2. 外语
  3. ______ in the costs of basic materials, including copper, cement, and even plywood, have made it virtually impossible for constr

______ in the costs of basic materials, including copper, cement, and even plywood, have made it virtually impossible for constr

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问题 ______ in the costs of basic materials, including copper, cement, and even plywood, have made it virtually impossible for construction firms to accurately forecast their spending.
选项 A、Invitations
B、Exposures
C、Fluctuations
D、Allowances
答案C
解析 fluctuation波动
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