6.I never regretted _____ the offer, for it was not where my interest lay. (1993)

A. not to accept B. not having accepted

C. having not accepted D. not accepting

(D, regret doing sth.表示“后悔做过某事”，事情已经发生了，常用动名词的一般形式表示动作已经发生了。)

7.He noticed the helicopter hovering over the field. Then to his astonishment, he saw a rope ladder _____ out and three men climbing down it. (1995)

A. throwing B. being thrown C. having thrown D. having been thrown

(B，see可与现在分词或不定式连用，平行结构，后面用了现在分词，这里也用分词;绳梯是被扔出飞机，因此要用被动结构，排除AC;see, watch, hear, feel, notice, observe,等词一般不跟分词的完成形式连用。)

8.Professor Johnson is said ____ some significant advance in his research in the past year. (1999)

A. having made B. ** C. to have made D. to make

(C，主语补足语的动作在谓语动词之前发生，用完成时。)

9. AIDS is said _____ the number-one killer of both men and women over the past few years in that region. (2002)

A. being B. to be C. to have been D. having been

(C, 同上。)

10.The Minister of Finance is believed _____ of imposing new taxes to raise extra revenue. (2004)

A. that he is thinking B. to be thinking C. that he is to think D. to think

(B，“人们认为财政部长正在考虑通过征收新税来增加政府的额外税入。”B“正在考虑”)