问题补充：
What do you think should the shopping list?
A. add to
B. be added to
C. be adding to
D. have added to
答案：
A. add to
(答案→)B. be added to
C. be adding to
D. have added to
解析：添加…到..应该用短语“add … to….”，但是物作主语应用被动语态。你认为购物单上应添加什么物品？选B
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