The mountains were______in thick cloud. A. clothing B. dressing C. clothed D. wearing

`=>` `C`

`+)` Bị động QKĐ: S + was/were + V-ed/P2 + (by O)

`+)` thick cloud (cụm từ): đám mây dày đặc

`+)` clothe (V-inf) `->` clothed (V2) `->` clothed (P2)

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