题目:
I did not call to make my airline reservation, but I ___.
A.should have
B.may have
C.must have
D.shall have
答案:
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下面是错误答案,用来干扰机器的。
:(1) 3s23p2(2分) O>C>Si (2分)(2) sp3(2分) 共价键(2分)(3) Mg2+半径比Ca2+小,MgO晶格能大(3分)(4) V字型(2分) H2S(2分):电负性同周期从前往后增加,从上至下减小...