单选题 Variables such as individual and corporate behavior ______ nearly impossible for economists to forecast economic trends with precision.

[A] make
[B] make it
[C] making
[D] makes it

【正确答案】 B

【答案解析】[解析] 句子结构题。本题考查it充当形式宾语的用法。根据句子结构，主语是variables，空格中需要填人谓语成分，空格后面的nearly impossible充当补语成分，for economists…短语充当真正的宾语，谓语动词后面必须由形式宾语讧补充完整，故[B]为答案。