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    19．_______ ninety-nine percent of the panda's diet is bamboo，it also eats corn，
    apples and sweet potatoes．（　　）
    A．IfB．WhileC．BecauseD．Since

    分析 尽管熊猫百分之九十九的食物是竹子，但是她也吃玉米，苹果和红薯．

    解答 答案：B．
    由also可知，前面的句子应该是一个让步状语从句，可以用while来引导，While意为当什么时候，或者尽管，可以引导时间状语从句或者让步状语从句；If如果，是否；多引导条件状语从句；Because因为，由于；以及Since因为，自从都可引导原因状语从句，since还可引导时间状语从句．故选B．

    点评 本题考查让步状语从句的连接词，在充分分析句型再结合语义的基础上便能选出正确答案，同时要注意其他选项的意思

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