The teacher left word with our monitor ___________ she would explain the problem again next time.
| A．who |
| B．which |
| C．as |
| D．that |
A group of children ______ hide and seek in the garden.
| A．is playing | B．are playing | C．has been playing | D．was playing |
Two kilograms ______ too heavy for a sick man.
| A．is | B．are | C．was | D．were |
Many a school and many a hospital ______ since 1949.
| A．have set up | B．has set up | C．have been set up | D．has been set up |
All that can be said ______.
| A．has been said | B．have been said | C．is said | D．are to be said |
Tom with his friends ______ volleyball since three o’clock.
| A．has been playing | B．is playing | C．have been playing | D．have played |