27.The question _______ at present has something important to do with our nature.
| A．to be discussed | B．to be discussing |
| C．discussed | D．being discussed |
—— I can’t get through to the general manager’s office anyhow.
—— The line is busy. Someone＿＿＿＿＿the telephone.
| A．must use | B．uses | C．must have been using | D．must be using |
—— Do you still remember the day when we went to the Great Wall?
—— I can’t remember it well, but＿＿＿＿＿＿sometime last autumn?
| A．might it be | B．could it have been | C．could it be | D．must it have been |
I wish you＿＿＿＿＿＿go with me tomorrow.
| A．will | B．would | C．shall | D．can |
It’s strange that they＿＿＿＿＿nothing about this matter.
| A．know | B．would know | C．knows | D．knew |
—— Could I use your telephone?
—— Yes, of course you ＿＿＿＿＿＿＿＿＿＿＿＿＿.
| A．could | B．will | C．can | D．might |