Question

 AIDS is said _______ the biggest health challenge to both men and women in that area over the past few years.

A. that it is                                                              B. to be

C. that is has been                                            D. to have been

Answer 1

解析：選D。It is said that+主語=主語+is said to do/have done; 由時間狀語可知應用現(xiàn)在完成時。

獨具【方法技巧】人或物+be said后的“多樣化”不定式

在此結構中，主語不可以是形式主語。

1

 不定式的一般式。該形式根據(jù)需要可用主動或被動式，表示兩種情況。

(1)表示不定式所表示的動作尚未發(fā)生或將要發(fā)生。

He is said to go abroad soon. 據(jù)說他不久要出國。

(2)表示一般情況(尤其是當不定式表示狀態(tài)而非動作時)。

The tigers are said to be endangered.

據(jù)說這些虎處于瀕危狀態(tài)。

2

 不定式的完成式。表示不定式所表示的動作已經(jīng)完成。該不定式根據(jù)需要可選用主動或被動式。

This book is said to have been translated into several foreign languages. 據(jù)說這本書已被譯成好幾種外語。

3

 不定式的完成進行式, 強調不定式所表示的動作迄今為止已經(jīng)持續(xù)了一段時間。

This film is said to have been going on for two months now. 據(jù)說現(xiàn)在這部電影已經(jīng)連續(xù)上演兩個月了。

4be said+不定式的進行式, 表示不定式所表示的動作正在進行。

They are said to be researching into the question.

據(jù)說他們正在研究這個問題。