31. —How long_________each other before they_________married?
—For about a year.
| A．have they known, get | B．did they know, were going to get |
| C．do they know, are going to get | D．had they known, got |
I took mathematics and physics because I think that ________ very important for me to make further research in this field.
| A．what is | B．they are | C．this | D．which are |
Where to get the materials and how to get them ________ at the meeting.
| A．have not discussed | B．have not been discussed |
| C．has not discussed | D．has not been discussed |
All but Dick ________ in Class Three this term.
| A．are | B．is | C．were | D．was |
You as well ________ right.
| A．I are | B．I am | C．as I am | D．as I are |
Either of you ________ going there tonight.
| A．will | B．was | C．is | D．are |