It ________be the vocabulary that caused you the problem in the exercise because you know a lot of words. (2013·安徽，34)
| A．may | B．couldn’t |
| C．should | D．needn’t |
相关试题
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 |
Wang Gang is considering buying a computer, is considered to be a great help in our work and study.
| A．as | B．which | C．that | D．what |
When we climbed up to the top of the mountain, we were all ___________.
| A．out of the breath | B．short of the breath |
| C．out of breath | D．short of breaths |
—I’ m sorry, but I didn’t mean__________ out your secret.
—But you know, letting out one’s secret means________ one’ s feelings.
| A．to let; to hurt | B．letting; hurting |
| C．to let; hurting | D．letting; to hurt |
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