After ________in the research for so man
题型:选择题
问题:
After ________in the research for so many years,the scientist succeeded in finding the result at last.
A.buried
B.being buried
C.having buried
D.having been buried
After ________in the research for so many years,the scientist succeeded in finding the result at last.
A.buried
B.being buried
C.having buried
D.having been buried