22. –Why, I couldn’t get you on the phone this morning.
--We _____ tennis in the yard when you called.
| A．must be playing | B．could be playing |
| C．must have played | D．must have been playing |
Is this school _____ you visited last year?
| A．where | B．that | C．the one | D．which |
The Great wall is the only one of the buildings on the earth_____ seen from the moon.
| A．which is | B．which are | C．that are | D．that is |
Is there anything ________ I can do for you?
| A．which | B．who | C．that | D．whom |
This is the first American film _______ I have ever seen.
| A．where | B．which | C．who | D．that |
Guilin is a city _______ has a history of more than 2,000 years.
| A．where | B．which | C．who | D．whom |