D,
是By the time的句型,后面有WILL了前面不用将来时,By the time有表示什么之前的意思,将来时的前面就是现在时.
值域是负无穷到正无穷（X不等于零）.先求导数y=1+1/x2,可知道导数值恒大于零,在X不等于零的情况下恒为增函数.当X分别取正负无穷大时,该函数的Y值也为无穷大.可以画出图线,这个题目就会一目了然.
第八题英语By the time you（ ）you have made the wrong decision,it w
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