A.who it was that 這是強調(diào)句型的特殊用法:對疑問詞進行強調(diào).
由于是用在賓從中的,因此.who要放在賓從的句首.
句意:你知道究竟是誰向警察報告了這次事故嗎?為什么不能選Bwho本身就可引導(dǎo)賓從,再加一個that,就多余了. 并且這兒是強調(diào)"究竟是誰" ,所以正解為A.Do you know who had reported the accident to the police?這樣？？Do you know who had reported the accident to the police?這個句子是對的呀!判斷是否是強調(diào)句,有一個方法: 如果去掉it was... that后原句的結(jié)構(gòu)及句意仍是完整的,就是強調(diào)句,反之,則不是或是錯誤的.選A,去掉it was... that后,句子是: Do you know who had reported the accident to the police?結(jié)構(gòu)及句意仍是完整的.選B,去掉it was who后,句子是: Do you know that had reported the accident to the police?這顯然不對.因此選A, 不能選B.