13．Please leave         6：00，then you'll be able to get there         time．（　�。�
A．till； inB．after； onC．behind； inD．before； on

分析 請(qǐng)?jiān)诹c(diǎn)之前離開，這樣你們才能按時(shí)到達(dá)那里．

解答 答案：D．
結(jié)合語(yǔ)境可以推斷這句話表達(dá)的意思是"請(qǐng)?jiān)诹c(diǎn)之前離開，這樣你們才能按時(shí)到達(dá)那里．"第一個(gè)設(shè)空處用介詞before表示"在…之前"，第二個(gè)設(shè)空處的介詞短語(yǔ)表達(dá)的意思是"按時(shí)"，應(yīng)該用  on time，故選D

點(diǎn)評(píng) 本題考查時(shí)間介詞的用法．熟記時(shí)間介詞的用法，掌握每一個(gè)時(shí)間介詞后跟的時(shí)間類型及每個(gè)時(shí)態(tài)常用時(shí)間狀語(yǔ)，是做題的關(guān)鍵．

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