He was in hospital for six months．He felt as if he was __________ from the outside world．
A.cut out
B.cut off
C.cut up
D.cut through
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B解析该题考查词义辨析.四个选项均为cut构成的短语动词，但所表达的意义不同：cutout剪掉，切掉；cut off剪下，切掉，隔离，阻碍；cut up切碎：cut through刺穿，克服困难.根据题干中前句他住院六个月的语境可判断出，他感到与世隔绝了，所以