问题补充：
Michael works a farm. His sister works a factory.
A. in, in
B. on, on
C. in, on
D. on, in
答案：
A. in, in
B. on, on
C. in, on
(答案→)D. on, in
解析：
这题考查介词的用法：第一空填on，表示在农场上，第二空填in表示在工厂里。所以选D。
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