问题补充:
the house was started before she went to Africa and now it is still under construction.
A. Working
B. Working at
C. Working on
D. Work on
答案:
A. Working
B. Working at
C. Working on
(答案→)D. Work on
解析:考查work做名词的用法:句意:房子的工作在她去非洲前就开始了,现在还在建设中。选D。
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