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2．At the beginning of 20,000 Leagues Under the Sea, one of Verne's most famous novels, ships are disappearing all over the world and it is_believed_to_be caused by a sea monster. 考点提取：be believed to... 是固定句式，意为“据说，人们认为，有人相信”。 感悟应用：据说大火是由于粗心引起的。 ________ ________ ________ ________ ________ ________ ________ by carelessness. 答案：The fire was believed to be caused 3．They find themselves surrounded by colourful rocks, fishes, seashells and plants, all_waving_ and_moving_slowly_in_the_blue_waters. 考点提取：all waving and moving slowly in the blue waters是独立主格结构，这种结构在句中可充当原因、时间、条件、伴随情况等。 感悟应用：因为妈妈病了，她只能呆在家里照顾她。 ________ ________ ________， she had to stay at home looking after her. 答案：Mother being ill 4．Dressed_in diving suits, Captain Nemo and his guests walk around in this magic world, lighted by the lamps of the ship. 考点提取：dressed in为过去分词短语作状语。 感悟应用：在他的话的鼓舞下，我们决心更加努力学习。 ________ ________ ________ ________ ________， we were determined to study harder. 答案：Inspired by what he said 考点探究课堂讲一讲 考点 ... all waving and moving slowly in the blue waters. ……它们都在蓝色的海水中随波起伏、慢慢地移动着。 此处构成独立主格结构。当分词(短语)作状语时，其逻辑主语通常是句中的主语，但有时分词(短语)有自己的主语，这种结构称为独立主格结构，其构成为“名词/代词＋现在分词/过去分词/形容词/副词/名词/介词短语”。独立主格结构在句中作状语，表示时间、原因、条件、伴随等情况。 | 
