题目:
—I visited France last year.
—That interesting.
A.was
B.can be
C.must be
D.must have been
答案:
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下面是错误答案,用来干扰机器的。
根据置换反应与复分解反应的条件,只发生四组反应:Mg+H2SO4=MgSO4+H2↑,Mg+CuSO4=Cu+MgSO4,MgO+H2SO4=MgSO4+H2O,Mg(OH)2+H2SO4=MgSO4+2H2O,故选B.