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  3. ______too much to do, they have to keep themselves busy all day long.

______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 分析句子结构可知，前面的分句为原因状语从句，其与逻辑主语they之间为主谓关系，所以应用现在分词having。故选A。
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