—I have got a headache.
—No wonder. You __________ in front of that computer too long.
| A．work | B．are working |
| C．have been working | D．worked |
________, I could not memorize the text.
| A．However hard did I try | B．However hard I tried |
| C．However I tried hard | D．However I had tried hard |
.Although the teacher did not mention any names, everybody knew who he was
| A．attending to | B．turning to | C．referring to | D．talking to |
You only had meat and fish yesterday. If you had eaten vegetables, theyeasily.
| A．would digest | B．digested | C．will digest | D．would have digested |
The telephone _______, but by the time I got indoors, it stopped.
| A．had rung | B．was ringing | C．rings | D．has rung |
Unluckily, we missed the train. weearly.
| A．must have set out | B．had set out |
| C．should have set out | D．set out |