the building is said(to have been pulled down)last month.

be said to do,據(jù)說.

be said that.據(jù)說.嗎,根據(jù)以上兩點,只能選擇帶有不定式的答案,只有前兩項.

last month,說明事情發(fā)生在過去.而to be pulled down表示將來要發(fā)生.to have been pulled down表示發(fā)生在謂語動詞is 前,發(fā)生在過去.所以答案應(yīng)該是to have been pulled down

不是it is said to嗎？be said to 怎么也可以呢？having been pulled down呢？只是因為他沒有to所以不能選啊，他的用法是什么？不是it is said to嗎？be said to 怎么也可以呢？學(xué)語法不能太死，這個題目中不就是把 it 換成了 the building 嗎，其他不都一樣嗎。就是因為這個用法，所以必須選擇 帶 to的選項having been pulled down是動名詞的完成被動式，表示動作發(fā)生在謂語動詞之前且表被動。舉個例子：He forgot having been taken to Guangzhou when he was five years old.他忘記五歲時曾被帶到廣州去過。其實to have been done和having been done用法一樣的吧，只是個別要加to和不加to的區(qū)別而已？除了said還有什么這么用??？to have been done和having been done用法一樣的吧，只是個別要加to和不加to的區(qū)別而已？嗯，主要區(qū)別在不定式和ing 上。比如一些后面經(jīng)常加to的單詞，remember，forget，regret 等