问题
写作题
Students are encouraged to _____ the design competition for robots at the university. [ ]
A. take part
B. operate
C. join to
D. participate in
答案
答案：D
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Students are encouraged to _____ the design competition for robots at the university. [ ]
A. take part
B. operate
C. join to
D. participate in
答案：D
下列四幅图的有关说法中，正确的是 