2. 外语
  3. Variables such as individual and corporate behaviour______nearly impossible for economists to forecast economic trend with preci

Variables such as individual and corporate behaviour______nearly impossible for economists to forecast economic trend with preci

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问题 Variables such as individual and corporate behaviour______nearly impossible for economists to forecast economic trend with precision.
选项 A、make
B、make it
C、making
D、makes it
答案B
解析 空处应填一词作复数名词variables的谓语，同时加上it作其形式宾语，因而选B项。
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