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

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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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