1 . Mr. Green must have been punished for his being rude at the meeting yesterday, didn’t he? (英译汉)

2 . 我们一定是走错路了，因为道路变窄了。(must have done)
________, because the road became narrow.

3 . 既然没有人帮助他, 他一定是独自完成了这项研究。(must have done)
Since nobody gave him any help, he ________.

4 . A large number of tourists complained about being stranded on the top of Yellow Mountain during the Spring Festival, waiting for cable cars that never came. The person in charge of Huangshan Scenic Area admitted they ___________better organized.

A．might have been

B．may have been

C．would have been

D．must have been

5 . 我相信他肯定遇到意外事件了，否则他会按时到的。(must have done)
I believe ______; otherwise he would have arrived on time.

7 . My pain _____ obvious the moment I walked into the room, for the first man I met asked sympathetically, “Are you feeling all right?”

A．must be

B．may be

C．might have been

D．must have been