it's one of the most important meetings____this yearA that has been heldB which has been heldC that have been heldD which have held

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it's one of the most important meetings____this yearA that has been heldB which has been heldC that have been heldD which have held
it's one of the most important meetings____this year
A that has been held
B which has been held
C that have been held
D which have held

it's one of the most important meetings____this yearA that has been heldB which has been heldC that have been heldD which have held
C
有one of 的定语从句中关系代词用that,从句的谓语动词用复数,所以选C.

a

c