1．To finish the task，we've tried three times，and after dinner we'll try     time．（　　）
A．the fourthB．a fourthC．fourthD．four

分析 為了完成這項(xiàng)任務(wù)，我們已經(jīng)嘗試了三次，在晚餐后，我們將再嘗試一次．

解答 答案：B；序數(shù)詞前加不定冠詞帶有"再""又"之意，在第三次基礎(chǔ)上又一次，用不定冠詞a；根據(jù)前面的敘述we've tried three times，我們已經(jīng)嘗試了三次，可知該空應(yīng)填a fourth time；指再一次．故選B．

點(diǎn)評(píng) 掌握序數(shù)詞的表達(dá)是解題的關(guān)鍵；還要根據(jù)語(yǔ)境，細(xì)讀選項(xiàng)，然后通過題干中的已供信息，捕捉到解題線索．

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