国家开放大学 / 综合英语（1）
正确率：100%
A subject _ _ _ _ is the mechanism of that equipment.
a.which continues to be intense debate
b. which there continues to be intense debate
c.what continues to be intense debate
d.on which it continues to be intense debate
a.which continues to be intense debate
b. which there continues to be intense debate
c.what continues to be intense debate
d.on which it continues to be intense debate
参考答案：
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