Which of the underlined parts functions as an appositive?

A、 A skilful hand at improving tools , Mike helped to make a new type of cutter.
B、 Being a poor teacher , she can't afford to buy a car for herself.
C、 Jane joined the line of people waiting for the train .
D、 Fresh from the oven , rolls are very delicious.

【正确答案】 A

【答案解析】解析：本题答案为A。一般情况下，同位语紧跟在被修饰语之后，但若同位语结构比较复杂，特别是主语又较短时，这类同位语可以提前，给它以突出的位置，选项A则为此种情况。B、D下划线部分在句中均作状语，C为分词作后置定语修饰people。