高等继续教育 / 经贸英语
正确率：100%
题型描述: 单选题
All powders are wrapped in plastic bags and packed in tins, the lids ＿＿＿＿ are sealed with adhesive tape (黏胶带).
A.at which
B.which
C.by which
D.of which
All powders are wrapped in plastic bags and packed in tins, the lids ＿＿＿＿ are sealed with adhesive tape (黏胶带).
A.at which
B.which
C.by which
D.of which
参考答案：
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