--Howlongdoyouthinkitwillbe

問題詳情：

--How long do you think it will be _________ <?xml:namespace prefix = st1 />China sends a manned spaceship to the moon?

   -- Perhaps two or three years.

  A. when          B. until           C. that          D. before

【回答】

D．

解析：本題考查連詞的用法。It will + some time + before… (需要多久才能…)

知識點：連詞

題型：選擇題