they should test the types of oil in the laboratory,____?

they should test the types of oil in the laboratory,____?
后加shouldn’t they 还是 didn't they
事实存在 1年前 已收到1个回答 举报

lijing2001 幼苗

共回答了19个问题采纳率:84.2% 举报

后加shouldn't they
如果是they did test the types of oil in the laboratory后面才加didn't they.

1年前

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