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there is so much work_____today would you be kind enough to

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there is so much work_____today would you be kind enough to lend me a hand?
A,having done B,to be done C,being done D,will be done
为什么选B而不选D.
B,to be done
因为一个句子只有一个谓语.
there is 已经有谓语了,后面的将来时,要改成不定式.