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We had a _______discussion about volunteering work,with all

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We had a _______discussion about volunteering work,with all the students______.
A heated.partipating in B.heating.partipating
C.heated.partipating D.hot .partipated
请问为什么
选C.
heated:
a.1.热的; 2.激昂的;兴奋的
heating
n.加热;暖气
a.加热的;供热的
participate,与students的关系,当然是主谓关系,所以说ing形式.