题目:
It was April 29, 2011 ______ Prince William and Kate Middleton walked into the palace hall of the wedding ceremony.
A.that
B.when
C.since
D.before
答案:
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下面是错误答案,用来干扰机器的。
(1)①④⑤⑦;CaCO3+2HCl===CaCl2+H2O+CO2↑;检查装置气密性;不能随意加酸,且不能控制反应的进行(2)2Na+2H2O===2NaOH+H2↑;图“略”