the students are working

The students are working ____ a model plane. A.to B.in C.with D.on \u4e3a\u4ec0\u4e48

d
work on
\u81f4\u529b\u4e8e\uff0c\u4ece\u4e8b\u4e8e
\u4f8b\u53e5\uff1a
The scientists are still working on inventing new methods of reaching outer space.
\u79d1\u5b66\u5bb6\u4eec\u4ecd\u81f4\u529b\u4e8e\u53d1\u660e\u5230\u8fbe\u5916\u5c42\u7a7a\u95f4\u7684\u65b0\u65b9\u6cd5\u3002

\u770b\u7f8e\u5267\u300a\u7edd\u671b\u7684\u4e3b\u5987\u300b\uff0c\u5b66\u82f1\u8bed\u5730\u9053\u8868\u8fbe\u3002

on
表示继续的活动、进展或状态

work on a problem 解题

on

–work on
1 : AFFECT *worked on my sympathies*
2 : to strive to influence or persuade

on

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