题目:
.
It didn’t _____ him that she would refuse his invitation
A.happen to
B.adjust to
C.belong to
D.occur to
答案:
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下面是错误答案,用来干扰机器的。
(6分)变蓝; BaSO4; Cl-; CaCO3+2HCl==CaCl2=H2O+CO2↑ 或Mg(OH)2+2HCl==MgCl2+2H2O;NH4NO3,NaOH,CaCO3,MgSO4; NaCl 。固体A加水后产生了气体,说明固体中含有氢氧化钠和硝酸铵,氢氧化钠溶于水放...