He is very busy ___his papers ,He is far too busy to callers.前一个是用writing 还是 write?求详解

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He is very busy ___his papers ,He is far too busy to callers.前一个是用writing 还是 write?求详解
He is very busy ___his papers ,He is far too busy to callers.前一个是用writing 还是 write?求详解

He is very busy ___his papers ,He is far too busy to callers.前一个是用writing 还是 write?求详解
Writing Be busy doing 意思是忙于做某事