问题
选择题
| — How long do you think it will be _____ China sends a manned spaceship to the moon? — Perhaps two or three years. |
A. when B. until C. that D. before |
答案
答案：D
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| — How long do you think it will be _____ China sends a manned spaceship to the moon? — Perhaps two or three years. |
A. when B. until C. that D. before |
答案：D