The climate conference was attended by 11,000 people, it the largest UN gathering ever held.
A. making
B. to make
C. made
D. to be making
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(答案→)A. making
B. to make
C. made
D. to be making
解析：考查非谓语动词作结果状语。To do 变出人意料的结果；doing表自然而然的结果。句意：气候大会有11,000人参加，从而使它成为曾经举行的最大的联合国会议。表自然而然的结果，所以选A。