_______ too much to do, they have to keep themselves busy all day long.A、Having

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问题 _______ too much to do, they have to keep themselves busy all day long.

选项 A、Having
B、Have
C、Had
D、Being

答案 A

解析本题考查分词用法。have前省略的逻辑主语为they，其与谓语的关系为主动，所以用现在分词having作原因状语，故选A。

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