Bob said he was going to join our club but he didn’t. What a shame! He ______ his mind.
| A．can’t have changed | B．mustn’t have changed |
| C．wouldn’t have changed | D．shouldn’t have changed |
Tony was very unhappy for _______ to the party.
| A．having not been invited | B．not having invited |
| C．having not invited | D．not having been invited |
Robert is said _______ abroad, but I don’t know what country he studied in.
| A．to have studied | B．to study |
| C．to be studying | D．to have been studying |
Though ________ money, his parents managed to send him to university.
| A．lacked | B．lacking of |
| C．lacking | D．lacked in |
Before you decide to leave your job, _______ the effect it will have on your family.
| A．consider | B．considering |
| C．to consider | D．considered |
The research is so designed that once _______ nothing can be done to change it.
| A．begins | B．having begun |
| C．beginning | D．begun |