—Have you known Dr. Jackson for a long time?
—Yes, since she ______ the Chinese Society.
| A．has joined | B．joins | C．had joined | D．joined |
——I let my secretary call you several times. Do you know that?
——I _____in a meeting. I’m sorry.
| A．had been | B．was | C．am | D．have been |
It was only when I reread his poem recently _____ to appreciate its beauty.
| A．that I began | B．did I begin | C．I began | D．until I began |
—— Andrew won’t like it, you know.
—— _____? I don’t care what he thinks of it.
| A．So what | B．What so | C．How come | D．What if |
I often read China Daily, ____of great help to my English study.
| A．which I think is | B．which I think it is | C．that I think is | D．I think is |
His father, who is said to be teaching in Australia, ____ in Nanjing University for more than 10 years.
| A．has worked | B．had worked | C．worked | D．has been working |