It might have_______ your notice but I am very busy at the moment.
| A．quit | B．neglected |
| C．escaped | D．denied |
—Someone wants you on the phone.
—________ nobody knows I am here.
| A．Although | B．And |
| C．But | D．So |
We had to be patient because it ________ some time ________ we got the full results.
| A．has been；since | B．had been；until |
| C．was；after | D．would be；before |
He was so deep in thought，thinking of the problem ________ he knocked into the tree without noticing it.
| A．when | B．while |
| C．because | D．that |
________ all of them are strong candidates，only one will be chosen for the post.
(2011·陕西，19)
| A．Since | B．While |
| C．If | D．As |
Please call my secretary to arrange a meeting this afternoon，or________it is convenient to you. (2011·江西，29)
| A．whenever | B．however |
| C．whichever | D．wherever |