43.No matter how frequently _A_, the works of Beethoven always attract large audiences.

　　A performed B performing C to be performed D being performed

　　perform vt. 表演，演出，演奏;

　　to be performed 將要被演奏; being performed 正在被演奏;

　　一些特殊的動詞：

　　第一點：forget 忘記; [反義] remember 記得;

　　這兩個詞后加動詞不定式表示將要進行的行為;這兩個詞后加動詞ing形式表示已經做過的事情。

　　注意：動名詞與現在分詞形式一樣，但含義不同。這兩個詞后加動詞ing形式都是動名詞。

　　forget to do sth. 忘記要去做某事; forget doing sth. 忘記做過某事;

　　remember to do sth. 記得要去做某事; remember doing sth. 記得做過某事;

　　62. I remember _B_ to help us if we ever got into trouble.

　　A once offering B him once offering C him to offer D to offer him

　　offer vt. 提出，提供; offer sb. sth. / offer to do sth.

　　him once offering 如果改成 his once offering 也正確。

　　動名詞的復合結構：凡是一個動詞的后面可以加動名詞，就可以加動名詞的復合結構。

　　動作發出者 + 動名詞;當動作發出者名字給出時：名詞所有格 + 動名詞;當動名詞的復合結構在文章中出現，且動作發出者在前文中提過時：形容詞物主代詞(賓格)+ 動名詞。

　　形容詞物主代詞：his, her, my, your, their, our。代詞賓格：him, her, me, you, us, them。

　　第二點：want 想要; want to do sth. 想做某事; want doing 客觀需要或缺乏。

　　48. Your hair wants _B_. You'd better have it done tomorrow.

　　A cut B cutting C to cut D being cut

　　注意：want doing 中doing表示的是被動含義。

　　18. This room is so dirty that it wants _A_.

　　A cleaning B to clean C being cleaned D cleaned

　　第三點：mean 意味; mean to do sth. 打算做某事，意欲… ;mean doing 意味著，…的意思是…

　　25. There's a man at the reception desk who seems very angry and I think he means _B_ trouble. [reception desk 接待臺]

　　A making B to make C to have made D having made

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　　55. The children went there to watch the iron tower _D_.

　　A to erect B be erected C erecting D being erected