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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

D


解析:

before常用于以瞬間動詞為謂語的肯定句和以持續動詞為謂語的否定句中,表示“在……之前”。根據所提供的情景“Perhaps two or three years.”可判斷出中國向月球發射載人人造衛星可能要兩年或三年的時間。when表示“在……的時候”。until用于肯定句表示動作一直持續到until從句中的動作開始。

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