_______ he met with the difficulty did he realize the importance of our help.
| A．Even though | B．Never until |
| C．Only before | D．Ever since |
Not until yesterday that I had made a serious mistake.
| A．didn’t I realize | B．did I realize |
| C．I didn’t realize | D．I realize |
—Mike likes watching TV but he doesn’t like playing football.
— .
| A．So does Tom | B．Neither is Tom |
| C．It’s the same with Tom | D．So is Tom |
We have been told that under no circumstances the computer in the office for personal affairs.
| A．may we use |
| B．did we use |
| C．we could use |
| D．we may use |
(2013·西安模拟)The man we followed suddenly stopped and looked as if
whether he was going in the right direction.
| A．seeing | B．having seen |
| C．to see | D．to have seen |
Not until I completed the form that half questions were not relevant to me.
| A．had I realized | B．I had realized |
| C．I realized | D．did I realize |