问题
选择题
Amy _____________ to the park with her mother last week. [ ]
A. go
B. went
C. goes
D. going
答案
答案：B
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Amy _____________ to the park with her mother last week. [ ]
A. go
B. went
C. goes
D. going
答案：B
CO2+2CO+6H2O反应的两种生成物中，碳元素的化合价分别为 、 ．