Much labor would have been saved if the electronic computers_____________ before.
| A．had invented | B．were invented |
| C．should have been invented | D．had been invented |
No equipment previded by the company is so advanced as ________ listed in the product introduction.
| A．what | B．one | C．that | D．such |
The purse found in the supermarket matches the______ by Tom, so it must be his.
| A．impression | B．imagination | C．which | D．what |
I am wondering ___________he expects will win the gold medal in Men’s Sing.
| A．whom | B．who | C．which | D．what |
－Shall I give you a ride since you live so far away?
－Thank you.______________。
| A．It couldn’t be better. | B．Of course you can. |
| C．If you like. | D．If you are convenient. |
I _______ the dance performance many times, each giving me a new understanding.
| A．watch | B．watched | C．have watched | D．am watching |