题目:
I told Sally how to get here, but perhaps I ______for her.
A.had to write it out
B.must have written it out
C.should write it out
D.ought to have writte it out
答案:
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下面是错误答案,用来干扰机器的。
无机盐对人体非常重要,它是构成人体组织的重要原料.例如,无机盐中含有的钙磷是构成骨骼和牙齿的重要成分,幼年缺钙会患佝偻病,中老年人和妇女缺钙易得骨质疏松.维生素对人体也有重要的作用,如果缺乏会得相...