_______ all the inventions have in common is _____they have succeeded.
A. What; what B. That; that C. What; that D That; what
–What’s that noise?
–Oh, I forgot to tell you. The new machine ______.
| A．was tested | B．will be tested | C．is being tested | D．has been tested |
I don’t believe you’ve already finished reading the book — I ______it to you this morning!
| A．would lend | B．was lending | C．had lent | D．lent |
The telephone _______, but by the time I got indoors, it stopped.
| A．had rung | B．was ringing | C．rings | D．has rung |
In recent years many football clubs ______ as business to make a profit.
A. have run B. have been run C had been run D. will run
Though we don’t know what was discussed, yet we can feel the topic_____.
| A．had changed | B．will change | C．was changed | D．has been changed |