题目内容
-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
解析:
解析:
|
before常用于以瞬间动词为谓语的肯定句和以持续动词为谓语的否定句中,表示“在……之前”。根据所提供的情景Perhaps two or three years.可判断出中国向月球发射人造卫星之前可能要两年或三年的时间。when表示“在……的时候”。until用于肯定句表示动作一直持续到until从句中的动作开始。 |
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