________who he was ,the guard regarded the new mayor as one of the visitors .A) Not having known B) Knowing not C)Having not known D) Not knowing 選A還是D 為什么?

熱心網友

選D 這是一個因果從句,并且前后要求主謂一致,因主句的主語是人,是動作的發出者,所以從句用主動形式,否定詞NOT應放在句首,又因為把從句補全是because he didn't know who he was 而不是 because he hasn't know...并且,主句時態是過去時,就算用have也應用 had .