题目内容：

得知地球上每年有几百种植物消失时,我们大家都非常震惊.(SHOCK)
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优质解答

Knowing that hundreds of plant species extint annually on earth,all of us were shocked.
[说明]
物种消失用extint；属于前置状语结构,用动名词可以表达；后面的主句应该是过去时态；每年annually．