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)
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