19．-______nearly took us an hour to walk here．
-Have a drink，then．You ______ be thirsty．（　　）
A．This；mayB．It；mayC．This；mustD．It；must

分析 -步行到這里花了我們將近一個(gè)小時(shí)的時(shí)間．-那就喝點(diǎn)東西吧．你們一定口渴了．

解答 答案：D  第一句中句型 It takes sb．some time to do something．意思是：做某事花費(fèi)了某人…時(shí)間．to walk here是真正的主語(yǔ)，為了避免頭重腳輕，通常在句首使用it做形式主語(yǔ)，而把真正的主語(yǔ)主語(yǔ)放在句子末尾． 第二個(gè)空，根據(jù)答語(yǔ)Have a drink，then．可以得知后面的肯定性推測(cè)：你們一定口渴了．情態(tài)動(dòng)詞表示推測(cè)時(shí)，may 或許，可能，語(yǔ)氣不夠肯定；must 一定，語(yǔ)氣肯定．故選D．

點(diǎn)評(píng) 在英語(yǔ)中，當(dāng)不定式、動(dòng)名詞、從句等用作主語(yǔ)主語(yǔ)時(shí)，為了避免頭重腳輕，通常在句首使用it做形式主語(yǔ)形式主語(yǔ)it，而把真正的主語(yǔ)主語(yǔ)放在句子末尾．

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