2. ________ in his football uniform, Martin seemed to be unusually muscular.
(A) Having dressed
(B) Dress
(C) Dressing
(D) Dressed

http://tw.knowledge.yahoo.com/question/question?qid=1612041800584

(Martin was) Dressed in his football uniform, he seemed to be unusually muscular.

此處用法是be dressed in衣服，因省略主詞與be動詞，留下dressed開頭，後方的代名詞he還原成人名Martin。

● wear = be dressed in = have sth. on 穿著（衣服）……

Example

I am wearing my favorite outfit. 我正穿著我最喜歡的衣服

I am dressed in my favorite outfit. (ditto如上)

I have my favorite outfit on. (ditto)

☆ "wear" 指穿衣服、鞋、手飾、噴香水、擦化妝品 ＝ put sth. on

I am not wearing any aftershave, so I carefully put it on.

我沒擦鬚後水，所以小心擦上。

☆ "be dressed in" + 顏色

He saw a man dressed in black. 他看見一位身穿黑衣的人。

● dress, dress up, get dressed 好好打扮、盛裝、穿好衣服

Example

The dress code is "dress to impress,” which means you need to dress up for the occasion. The party starts at 8 pm and it is 7:30. You have to get dressed.

派對的著裝要求是 「好好打扮，給人留下好印象」，意思是你得盛裝出席。派對晚間八點開始，現在是7:30，你得穿好衣服。

● slip into sth. , throw on sth. 指快速、飛快、匆匆穿上……

He slips into his suit, throws on a coat and slams the door. 

他飛快地穿上西裝，匆匆地套上大衣，然後關門外出。

● get dressed 指催促人趕快穿好衣服，也可以這麼說（祈使句）：

Get dressed, please. 

Reference: https://elt.rti.org.tw/q-and-a/put-on-wear-dress-and-be-dressed-in-用英語說-「穿」/