The girl ______ in America for years． After graduation, she returned home, quite at a loss during her hunt for a job．

A．was studied

B．has been studied

C．studied

D．was studying

一油漆女工，皮肤龟裂，黏膜水肿，血象检查异常。工作中接触多种有毒物质。与该女工的异常表现最可能有关的有毒物质是（）

A.甲苯

B.二甲苯

C.丙酮

D.苯

E.乙酸乙酯