问题
选择题
Mr. Johnson insisted that he _____ his debts, but nobody believed him. [ ]
A. pay
B. pays
C. paid
D. had paid
答案
答案：D
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Mr. Johnson insisted that he _____ his debts, but nobody believed him. [ ]
A. pay
B. pays
C. paid
D. had paid
答案：D
（g）+CO（g）
CH
OH（g）；ΔH=－90.8 kJ·mol
移向__________电极（填Fe或C）；
溶液。