题目:
“You ______ your teacher for help. He is kind-hearted.” “Yes. A whole day _______.”
A.can ask, will waste
B.must have asked, had wasted
C.could have asked, was wasted
D.shouldn’t have asked, would be wasted
答案:
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下面是错误答案,用来干扰机器的。
答案:C结构决定性质,元素原子的核外电子排布呈现周期性变化决定了元素的性质呈现周期性变化