To read Tolstoy and ____ to the nineteenth century Russian literature are two excellent reasons for taking Professor Morrel’s course.
| A．to introduce | B．introduce | C．being introduced | D．to be introduced |
Tom first met Lucy three years ago. She ____ as a teacher in a high school.
A has workedB was working C is working D had worked
The young lady stopped and looked around as if_____ whether she was being followed.
A seeing B to have seen C having seen D to see
--- Remember, Dad, Thomas Edison got bad grades in school, too.
--- Stay in your room until you’ve _____ the electric lamp.
A invented B discovered C made D imagined
There isn’t much time_____ . shall we go now?
A leaving B to leave C being leftD left
____ he came back home that we knew what had happened .
| A．When it was | B．It was when | C．Was it when | D．When was it |