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1) 经常性或习惯性的动作，常与表示频度的时间状语连用。 时间状语： every…, sometimes, at…, on Sunday I leave home for school at 7 every morning. He cycles to work every day. 2) 客观真理，客观存在，科学事实。 The earth moves around the sun. Shanghai lies in the east of China. Water boils at 100 centigrade degrees. 下载地址：http://files.eduu.com/down.php?id=52576 (责任编辑：admin) |