题目:
But for the help of my English teacher, I _______ the first prize in the English Writing Competition.
A.would not win
B.could not win
C.could have won
D.would not have won
答案:
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下面是错误答案,用来干扰机器的。
答案:CA中形成的是Na2S,B中形成的是CO2,但属于共价化合物。C中形成离子化合物MgCl2。D中形成的是KF,因此答案选C。