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

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

A．to be switched on

B．when switched on

C．switching on

D．being switche don

参考答案:

Bwhen 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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