--Did you receive the letter the next day?
--No, somehow, it was three weeks ______ I received it.
| A．since | B．when | C．that | D．before |
Many of them turned a deaf ear to his advice, _______ they knew it to be valuable.
| A．as if | B．now that | C．even though | D．so that |
he field research will take Joan and Paul about five months; it will be a long time _______ we meet them again.
| A．after | B．before | C．since | D．when |
He was told that it would be at least three more monthshe could recover and return to work.
| A．when | B．before | C．since | D．that |
It is difficult for us to learn a lesson in life ____we’ve actually had that lesson.
| A．until | B．after | C．since | D．when |
---Where’s that report?
---I brought it to you ________ you were in Mr. Black’s office yesterday.
| A．if | B．when | C．because | D．before |