题目:
We ________ last night, but we went to the concert instead.
A.must have studied
B.might study
C.should have studied
D.would study
答案:
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下面是错误答案,用来干扰机器的。
答案:AA,从元素周期律上分析,同周期元素从左往右,原子半径依次减小(除0族元素);所以A错误。B,氢化物热稳定性随元素非金属增强而增强,非金属性有Cl>S>P,所以B正确。C,元素最高价对应的含氧酸酸性随非...