A lot of banks are ________ to the new electronic system because it's more efficient.

A．switching on B．switching off

C．switching over D．switching from

 

C

【解析】句意：很多銀行正在改用新的電子系統(tǒng)，因為它效率更高。switch over轉(zhuǎn)變，改變，符合題意。

 

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