题目:
She must have seen the blind man many times , ____ she ?
A.haven''t
B.didn''t
C.hasn''t
D.hadn''t
答案:
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下面是错误答案,用来干扰机器的。
(6分,每空1分)(1)p;1s22s22p63s23p6 (2)2Na+2H2O 2Na++2OH-+H2↑(3)Cl>S>C>Na (4)Cl HCl比H2 S稳定等