8．-Great changes have taken place in Beijing      he left for America in 1989（　�。�
A．sinceB．whenC．untilD．while

分析 自從1989年他去了美國(guó)以后，北京發(fā)生了很大的變化．

解答 答案：A；
結(jié)合語(yǔ)境推斷句意是"自從1989年他去了美國(guó)以后，北京發(fā)生了很大的變化．"，此句中的謂語(yǔ)動(dòng)詞用了現(xiàn)在完成時(shí)，本題設(shè)空處后面的時(shí)間狀語(yǔ)從句用了一般過(guò)去時(shí)，所以結(jié)合句意用現(xiàn)在完成時(shí)的標(biāo)志詞since引導(dǎo)，故選A

點(diǎn)評(píng) 本題主要考查連詞的用法，連詞在句子中主要起聯(lián)系上下文的作用，他們之間的區(qū)別就是表示邏輯關(guān)系的不同，所以在解題時(shí)先要理解上下文含義，然后根據(jù)上下文邏輯關(guān)系選擇合適的連詞．是做好此類(lèi)題型的關(guān)鍵．

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