Lots of the scientists in our country are working hard to ____the planet Mars .
| A．cover | B．search | C．discover | D． explore |
相关试题
35. If English ______ included in the examinations, few students would choose it.
| A．weren’t | B．isn’t  |
C．hasn’t been | D．hadn’t been |
34. The student will be suspended from school____he apologizes to his desk-mate before the class.
| A．even | B．when | C．unless | D．once |
33. --- How can you be late for such an important conference?
--- Sorry! But my flight was ______ by fog.
| A．taken over | B．held up | C．turned down | D．handed out |
32. The small fishing village has ______ into a modern city in thirty years.
| A．extended | B．existed | C．explored | D．expanded |
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