When I said someone cheated in the English exam, I ______ you.
| A．wasn’t referring to | B．had referred to | C．hasn’t referred to | D．will refer to |
His study in Peking University lasted four years, ______ he founded his own company in Hong Kong.
| A．after which | B．after when |
| C．after that | D．after it |
I just don’t understand _______ that prevents so many Americans from being as happy as one might expect.
| A．why it does | B．what it does |
| C．what it is | D．why it is |
—What do you think of _____gifted chemist from London?
— Well, sometimes his behavior is beyond ______comprehension.
| A．a; the | B．the; / |
| C．the; the | D．a; / |
— Did you remember to give Jack the book?
—Yes, I gave it to him ______ I saw him.
| A．while | B．immediately |
| C．once | D．suddenly |
— Lucy looks so upset. She ______ the driving test.
— It is the second time that she has failed in the test.
| A．can’t pass |
| B．mustn’t pass |
| C．can’t have passed |
| D．mustn’t have passed |