【題目】______ as chairman of Alibaba, Jack Ma is helping build a credit system for small businesses.

A.To resignB.ResignedC.ResigningD.Having resigned

【答案】D

【解析】

考查非謂語動詞。句意:辭去阿里巴巴董事長之后，馬云在幫助建立小企業(yè)的信用系統(tǒng)。根據(jù)句意可判斷，分句部分無主語故resign需要用非謂語動詞，又因為resign發(fā)生在is helping之前。所以需要用having done的形式做狀語。故選D項。

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