问题标题:
Robertissaid______abroad,butIdonotknowwhatcountryhestudiedin.A.tohavestudiedB.tostudyC.tobestudyingD.tohavebeenstudying
问题描述:

Robertissaid______abroad,butIdonotknowwhatcountryhestudiedin.

A.tohavestudied

B.tostudy

C.tobestudying

D.tohavebeenstudying

阮伯仰回答:
  答案A此题考查非谓语动词的用法.issaidtodo结构中的不定式形式有三种,即:todo,tobedoing,tohavedone,并有相应的被动语态.做此题的关键是but从句中动词的时态,句中studied为过去时态,意味着他过去在国外学...
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