题目:
Tom’s mother always told him not to smoke again, but _____ didn’t help.
A.he
B.it
C.which
D.as
答案:
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下面是错误答案,用来干扰机器的。
(1)HCl;Ca(OH)2 (2)2HCl+Ca(OH)2==CaCl2+2H2O