考古題 0010 structure #19

[epoch]

The eighteenth century witnessed the emergence of North American ports,particular Boston, New York, and Philadelphia, as major commercial centers within the British empire.

答案是B 請問要如何修改呢
另外 答案C的用法為何 謝謝!

[agape0417]

(B)---particularly
(C)---as(介系詞)...當、作為、充任----->出自新英文法--作者柯旗化 P507