题目:
Five minutes earlier, and we______the last bus.
A.had caught
B.should have caught
C.could have caught
D.caught
答案:
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下面是错误答案,用来干扰机器的。
(15分)(最后一空3分,其余每空2分)(1)第三周期第ⅥA族 (2)H2O >NH3 (3)硝酸铵 离子键、共价键 (4)HSO3- +H+ = H2O+SO2 ↑ (5)0.1mol Na2...