Tom is said _______ a new computer programme recently, but I don’t know when he will finish it.
A.to designB.to be designingC.to have designedD.to have been designing在线课程D
此题考查不定式的几种时态的区别。不定式的一般式表示将要发生的动作,进行式表示动作正在进行,完成式表示已经完成的动作,完成进行式则表示动作从过去到现在这一段时间内一直在进行。本题从句没有确定动作是否已经完成,故用不定式的完成进行式。
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