Tom, ________________ you from taking a hand in that affair, you ______________ in prison.
| A．if I didn’t stop; would have stayed |
| B．had I stopped; would be staying |
| C．shouldn’t I have stopped; would stay |
| D．if I hadn’t stopped; would have stayed |
.The boy told his father that he would rather ______ an astronaut.
a. become b. to become c. becoming d. became
.He is really incompetent! The letter ______ yesterday.
a. should be finished typing b. must be finished typing
c.must have finished typing d. should have been finished typing
You ______ the examination again since you had already passed it.
a. needn’t have taken b. didn’t need to take c. needn’t take d. mustn’t take
“I wonder why they’re late.” “They ______ the train.”
a. can have missed b. could miss c. may have missed d. might miss
The elephants ought ______ hours ago by the keepers.
a. to be fed b. to feed c. to being fed d. to have been fed