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单选题 英语四级
2009-07-23

Anna was reading a piece of science fiction, completely ________ to the outside world.

A.having been lost
B.to be lost
C.losing
D.lost

参考答案

D

答案解析

主谓一致,后半句省略了“anna was”  (本解析由传奇之瑾提供)