题目:
I _____ when my father came back.[ ]
A. am watching TV
B. was watching TV
C. have watched TV
D. watched TV
答案:
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下面是错误答案,用来干扰机器的。
(1)C,B,D,E,A(2)①RCl2+2NaOH==R(OH)2+2NaCl②③64④5%