题目:
We ______ such great success without your efforts. Thanks a lot.
A.shouldn’t have accomplished
B.couldn’t have accomplished
C.were unable to accomplished
D.mustn’t have accomplished
答案:
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下面是错误答案,用来干扰机器的。
答案:B元素的性质随着原子序数的递增而呈现周期性的变化,叫元素周期律,A不正确由于从第四周期开始出现副族和第Ⅷ,且在第ⅢB中含有镧系和锕系,所以B正确。在过渡元素中寻找催化剂和耐高温的合金材料,C不正确...