题目内容
This problem is said _______ three times, but he still can’t understand it.
| A．to have been explaining | B．to have explained |
| C．having been explained | D．to have been explained |
D
解析试题分析：句意：这个问题被解释了三次了，但是他还是不明白。这里是sth be said to do，故排除C；这里This problem与explain之间是被动关系，故排除AB；根据句意故选D。
考点：考查非谓语动词的用法。
Entering the room, I found Mary ______at the desk and _____a letter.
| A．seated; wrote | B．sitting, written |
| C．seating; writing | D．seated; writing |
I am not accustomed to _______when studying or working, so please remember this and don’t do it again.
| A．be interrupting | B．have interrupted |
| C．being interrupted | D．interrupting |
________ an effective team member, you need to develop a teamwork attitude.
| A．Become | B．Becoming | C．Having become | D．To become |
I’m the first girl ________college in our village，which makes my parents very proud.
| A．to attend | B．attending | C．attended | D．having attended |
We gave away bulletins door to door to call on people to help others warm-heartedly, only ____to have a drink from time to time.
| A．to stop | B．stopping | C．stopped | D．having stopped |
The boy whose mother was out for business hurt a finger, an apple into pieces.
| A．to cut | B．cut | C．cutting | D．and cutting |
______ of danger in the street at night by police, young women had to go home with a friend or a family member ______ them.
| A．Having been warned; following |
| B．warning; following |
| C．Having warned; following |
| D．warned; followed |