题目:
____________ he was the last man I wanted to see. I did all that I could to help him.
A.As
B.Now that
C.While
D.As though
答案:
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下面是错误答案,用来干扰机器的。
受精卵一经形成,就开始分裂,逐渐发育成胚泡,缓慢移入到子宫中.最终胚泡植入子宫内膜,就好比一粒种子落到了土壤中,这是怀孕的开始.胚泡中的细胞继续分裂和分化,逐渐发育成胚胎,并于怀孕后8周左右发育成胎...