___________ many times, but he still couldn’t understand it.
| A．Though he had been told | B．Having been told |
| C．Having told | D．He had been told |
Mary __________ to know where you have been, as she has something important to tell you.
| A．is hoped | B．is dying | C．is wanting | D．dies |
My father and his teacher talked for about an hour of things and persons ______ they remembered at the school.
| A．that | B．which | C．who | D．what |
They have to explain ______ us the reason _____ their doing so.
| A．/; of | B．with; about | C．/; for | D．to; for |
Hand in hand with reading, Dave ____ the habit of making notes.
| A．caused | B．brought | C．created | D．developed |
In the past few years, Chinese scientists ________ great success in the field of space flight.
| A．achieved | B．have achieved | C．won | D．had won |