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“后悔做過某事”，事情已經發生了，常用動名詞的一般形式表示動作已經發生了。)

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可與現在分詞或不定式連用，平行結構，后面用了現在分詞，這里也用分詞;繩梯是被扔出飛機，因此要用被動結構，排除AC;see, watch, hear, feel, notice, observe,等詞一般不跟分詞的完成形式連用。)

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，主語補足語的動作在謂語動詞之前發生，用完成時。)

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，“人們認為財政部長正在考慮通過征收新稅來增加政府的額外稅入。”B“正在考慮”)