They thought too much about ______.
| A．which I had said | B．what I had said |
| C．that I had said | D．I had said |
By the time he got up, I ______ for two hours in the factory.
| A．have worked | B．worked | C．was working | D．had been working |
Was it through Mary _____ was working at a high school ____ you got to know Tom?
| A．who; who | B．that; which | C．who; that | D．who; which |
—Do you mind if I open the window?
—________.I feel a bit cold.
| A．Of course not | B．No, please don’t. | C．I’d rather you didn’t | D．Go ahead |
Yao Ming is generally ________ as the best basketball player in the world.
| A．substituted | B．acknowledged | C．contradicted | D．recommended |
_______environmental damage is done, it takes many years for the ecosystem to recover.
| A．Even if | B．If only | C．While | D．Once |