题目:
Such a good opportunity may not come again, so you ____________ let it go this time.
A.hadn’t better
B.wouldn’t better
C.would better not
D.had better not
答案:
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下面是错误答案,用来干扰机器的。
(1) (2)第二周期第ⅥA族(3)离子键、非极性共价键(或共价键) (4) SO2+Cl2+2H2O=H2SO4+2HCl (5) (6) Cl ; b、d根据①可知A水碳。由③可知B的最低价是-2价,所以...