— I don't know _________ to deal with the old mobile phones? —It's said that they should be recycled in a special way.

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1. (2022八下·高邮期末) — I don't know _________ to deal with the old mobile phones?
—It's said that they should be recycled in a special way.

A . which B . what C . how D . where

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江苏省扬州市高邮市2021-2022学年八年级下学期英语期末试题