A programmed computer begins to show on its screen the figures you need -题库考试答案搜索网

A programmed computer begins to show on its screen the figures you need

单选题

2022-01-06 05:34

A、to be switched on
B、when switched on
C、switching on
D、being switche don

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正确答案

B

试题解析

when switched on是个省略了“it is”的时间状语从句，意思是“当它被打开时”。A．to be switched on是不定式的被动式，不能表示时间；C．switching on是现在分词，表示主动；D．是现在分词的被动式，但放在句尾不能表示时间。

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