0ffa，the King of _______，built the great earthwork known as Offa’s Dyke along his western borders to keep out the Welsh.
A.Maryland
B.Quebec
C.French
D.Mercia
E.Henry Ⅶ
F.400
G.mixed member proportional
H.Sussex
I.five
J.Northern Ireland
K.immigrants
L.300
【正确答案】：D
【题目解析】：【考点点击】本题主要考查七国时代。
【要点透析】麦西亚国王奥发在西部边境修建了伟大的土方工程——奥发大堤，以抵御威尔士人的入侵。P97
