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小時的時間．-那就喝點東西吧．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：做某事花費了某人…時間．to walk here是真正的主語，為了避免頭重腳輕，通常在句首使用it做形式主語，而把真正的主語主語放在句子末尾． 第二個空，根據(jù)答語Have a drink，then．可以得知后面的肯定性推測：你們一定口渴了．情態(tài)動詞表示推測時，may 或許，可能，語氣不夠肯定；must 一定，語氣肯定．故選D．

點評 在英語中，當(dāng)不定式、動名詞、從句等用作主語主語時，為了避免頭重腳輕，通常在句首使用it做形式主語形式主語it，而把真正的主語主語放在句子末尾．

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