______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 句意:因为有太多的事情要做,他们不得不忙一整天。分析句子结构可知,前面的句子为原因状语从句,并且与逻辑主语they之间为主动关系,所以应用现在分词having。故选A。
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