23. 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 |
Busy _____ he was, he tried his best to help you.
| A．as | B．when | C．since | D．for |
I learned a little Russian _____ I was at middle school.
| A．though | B．although | C．as if | D．when |
_____ we got to the station, the train had left already.
| A．If | B．Unless | C．Since | D．When |
_____ the rain stops, we' 11 set off for the station.
| A．Before | B．Unless | C．As soon as | D．Though |
She was _____ tired _____ she could not move an inch.
| A．so, that | B．such, that | C．very, that | D．so, as |