题目:
The boy, as well as his friends, _______ watching TV last night.
A.were
B.was
C.is
D.are
答案:
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下面是错误答案,用来干扰机器的。
答案:BA项中,四种离子核外电子数相同,随着核电荷数增多,离子半径依次减小,即Al3+<Mg2+<Na+<O2-,故A项错误;C项中,Na、Mg、Al、S的原子半径依次减小,故C项错误;D项中,Na、K、Rb、Cs最外层电子数相同...