19.Tony is a determined person.________ he has a dream,he will try his best to realize it.( 。
A.UnlessB.SinceC.OnceD.While

分析 托尼是個意志堅定的人,一旦有了夢想,他就會盡最大的努力去實現(xiàn)它.

解答 答案為C
unless"除非,如果不",引導(dǎo)條件狀語從句;since"因為,自從";once用作連詞時,意為"一旦…就…",相當(dāng)于as soon as; while"當(dāng)…的時候,只要,盡管".聯(lián)系前后語境,并根據(jù)Tony is a determined person這個前提,可知他應(yīng)該是"一有了夢想,就會盡力去實現(xiàn)",選項C.Once符合語境.

點評 本題是連詞的辨析題.在熟悉常用單詞的基本詞義基礎(chǔ)上,我們還要掌握常用詞匯的不常用或特殊用法,從而獲取正確答案.

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