Question

Robert is said _____ abroad, but I don’t know what country he studied in. A．to have studied B．to

Robert is said _____ abroad, but I don’t know what country he studied in.
A．to have studied
B．to study
C．to be studying
D．to have been studying

I bitterly regret _____ the story yesterday.
A．not to tell
B．have not told
C．not telling
D．not having been told

She did not feel equal______visitors.
A．to receive
B．to receiving
C．in receiving
D．receive

要详细的解释

Answer 1

1.D 这里并不是被动语态，这句话的意思是据说Robert在国外学习过，但是我不知道他在哪个国家学习过。这里要表达出的是去过国外学习的状态，所以用have been形式表示曾经去过/在
2.C 我非常遗憾昨天没有讲那个故事。regret doing sth 遗憾/后悔做某事（事情做过了） 如果是regret to do的话意思是遗憾/后悔做某事（事情还未做）
3.B 她觉得身体不适不能接待客人。be/feel equal to doing sth等于be able to do sth，这里的equal是有力气，能够胜任的意思，feel equal to感到有力气去做

Answer 2

1. 动词不定式的完成式表示先于谓语动词动作发生，因为后面是studied,所以在国外学习是以前发生的，选A
2. 选C regret doing=regret having done ,后悔之前做过某事
3. 选B

Answer 3

1,D,被动语态，根据后面的Don't知道是现在时态，所以选D
2,C，regret doing sth
3 A,感觉是样，
兄弟，答案揭晓那天告诉我一声，我6级过了，，O(∩_∩)O哈哈~

Answer 4

1D
2c
3a