Had he not come an hour earlier, he＿＿＿the secret that his mother was always there.
| A．must never find | B．must never have found |
| C．would never find | D．would never have found |
I couldn't have got to the meeting on time - _______ an earlier train .
| A．if I had not caught | B．unless I had caught | C．if I did not catch | D．unless I caught |
I'd better not catch ______ that again !
| A．your doing | B．you doing | C．you to do | D．you being doing |
I posted the letter some time _____ the week .
| A．in | B．during | C．throughout | D．within |
Take a taxi , _____ you'll miss your train .
| A．and | B．if | C．otherwise | D．or |
If you _____ stop smoking , you can only expect to have a bad cough .
| A．won't | B．would not | C．do not | D．can not |