7．The research is so designed that once nothing can be done to change it．［NMET2002］ A．begins B．having begun C．beginning D．begun [簡析]答案為D.once begun在句中作條件狀語.它是狀語從句once it is begun的省略形式.句意為:這項調(diào)查研究事先計劃的如此完好.以致于一旦開始.什么也無法改變它. 【查看更多】

 

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the research is so designed that once ____ nothing can be done to change it．

A．begins

B．having begun

C．beginning

D．begun

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The research is so designed that once ____________ nothing can be done to change it．

A．begins B．having begun　 C．beginning　 D．begun

 

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The research is so designed that once ________ nothing can be done to change it．

[　　]

A．begins

B．having begun

C．beginning

D．begun

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The research is so designed that once ________nothing can be done to change it．

A．begins　　　　　　　　  B．having begun

C．beginning　　　　　　   D．begun

 

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The research is so designed that once ________nothing can be done to change it．

A．begins　　　　　　　　  B．having begun

C．beginning　　　　　　   D．begun

 

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