The students are working ____ a model plane.A.to B.in C.with D.on 为什么
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Thestudentsareworking____amodelplane.A.toB.inC.withD.on为什么Thestudentsareworking____amodelplane.A.toB
The students are working ____ a model plane.A.to B.in C.with D.on 为什么
The students are working ____ a model plane.A.to B.in C.with D.on 为什么
The students are working ____ a model plane.A.to B.in C.with D.on 为什么
d
work on
致力于,从事于
例句：
The scientists are still working on inventing new methods of reaching outer space.
科学家们仍致力于发明到达外层空间的新方法.
on