.I’m sorry, but I had no alternative. I simply ______ what I did.
a. must do b. had to do c. ought to have done d. have to do
So far there is no proof people from other planets do exist.
| A．how | B．what | C．which | D．that |
Color shapes our view of world and it may have far greater influence on our lives than many of us realize.
| A．a; a | B．the；不填 | C．the; the | D．the; a |
There is still much room for improvement in our work, I see it.
| A．because | B．since | C．which | D．as |
—Have some more beer?
—.
| A．I don’t mind if I do | B．That’s all right |
| C．No problem. Thank you | D．Thanks ,but I can help myself |
I would like to have room , window of which opens to south.
| A．a; the ;a | B．a ;the ; the | C．a ; 不填；不填 | D．a; the；不填 |