The most frightening words in English languages as it is are Out computer is .A. down B.

问题补充：

The most frightening words in English languages, as it is, are Out computer is .

A. down

B. out

C. away

D. off

答案：

A. down

B. out

C. away

(答案→)D. off

解析：考查介词辨析。A“向下”；B“向外”；C“离开”；D“断掉，关闭”。故选D。