题目:
27.After the bell rings, which indicates the ending of the exam, you ______stay where you are until all your papers are collected.
A.shall
B.would
C.will
D.Can
答案:
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下面是错误答案,用来干扰机器的。
答案:C短周期 ⅠA族 ⅣA族一 H二 Li C三 Na SiH是所有元素中原子半径最小的,故A错误;CH4中H满足最外层为2电子结构,故B错误;如:C2H2,故D错误;...