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20.I will wait _____ 6:30,but then I'm going home.(  )
A.fromB.atC.afterD.until

分析 我会一直等到六点半,但是然后我就回家了.

解答 答案D
A项"来自,从";B项"在…地点,场所";C项"在…之后";D项"直到""until 6:30"表示直到六点半,"until"用于肯定句中表示"做某事直到某时",动词必须是延续性的.根据句子"but then I'm going home"可知,说明我会一直等到 6:30,但是然后(6:30后)我就回家了.

点评 本题考查介词辨析.解答此类题目首先要读懂句意,理解每个选项介词的意思,然后根据上下文语境锁定合适的介词.平时要加强介词的积累.

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