—Did you find the missing couple in the mountain yesterday?
—No, but we ________ to get in touch with them ever since.
| A．have tried | B．have been trying |
| C．had tried | D．had been trying |
Most computer users think it necessary for their software ________ regularly．
| A．to up date | B．to be updated |
| C．to have been up dated | D．to have updated |
_________ you are on holiday,you should enjoy leisure time and take your focus off your work．
| A．Now that | B．Even if | C．If only | D．As though |
By the time I left the concert，my ears_________，with complex feelings filling my heart．
| A．had rung | B．were ringing | C．were to ring | D．rang |
When you have any questions，tum to Jane or Lucy or _________ your group．
| A．whichever | B．whoever | C．whatever | D．wherever |
— What about your self-drive trip yesterday?
— Tiring! The road Was being widened，and we _________ rough ride.
| A．have | B．would have | C．had | D．have had |