______ (据估计到2010年), the population of the world will have reached 7 billion.It i

游客2023-07-18  24

问题 ______ (据估计到2010年), the population of the world will have reached 7 billion.

选项

答案 It is estimated that by 2010

解析 “据估计”It is estimated;“到2010年”by 2010。在本句中,It为形式主语,真正的主语是the population... billion,因主语较长,为避免头重脚轻,故将主语放在句尾,并用It代替放在句首。
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