题干
Michael works _______ a farm. His sister works ____ a factory.
A：in, in
B：on, on
C：in, on
D：on, in
答案(点此获取答案解析）
D
Michael works _______ a farm. His sister works ____ a factory.
A：in, in
B：on, on
C：in, on
D：on, in
