Mrs White foung her husband surrounded by letters and papers

答案：looking
1.found为感官动词,her husband为宾语,后面有两个并列的宾语补足语,即：
surrounded by letters and papers 和 ___ very worried.
2.宾语her husband和第一个宾语补足语动词surround之间为被动关系,所以用surrounded by letters and papaers；
但是宾语her husband和第二个宾语补足语look worried之间为主动关系,所以用现在分词looking.
短语look worried为系表结构,其中look是系动词,而系动词是不能用于被动结构的.
3.刚才已经说清楚了：___ very worred是和surrounded by letters and papers并列的,都是做her husband的宾语补足语.
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