题目内容

13、--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

试题答案

13、D.

解析:本题考查连词的用法。It will + some time + before… (需要多久才能…)

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