E-shopping, when properly _______, can save us a lot of time and energy.

A. done     B. is done    C. having done    D. doing

 

A

 

考查狀語(yǔ)從句的省略。主從句主語(yǔ)一致,謂語(yǔ)動(dòng)詞是be動(dòng)詞時(shí),主語(yǔ)和謂語(yǔ)一起省略。

 

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