He saw it as a rare opportunity to attend the annual____ as a production assistant.（ ）
A、prevention
B、precaution
C、convention
D、conclusion
【正确答案】：C
【题目解析】：prevention[U]预防,防止 precaution [C] 预防措施 convention 大会，集会 conclusion 结论
He saw it as a rare opportunity to attend the annual____ as a pr
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