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答案解析:
1.答案:He must have communicated/talked with his parents
详解:
考查情态动词表示猜测:must have done表示对过去事情作很有把握的推测。
考查词语:“跟…沟通”译为communicate/talk with sb.
2.答案:（that）food security/safety gave rise to lots of problems
详解:
考查seeing that“由于，鉴于”引导的原因状语从句，that可以省略。
考查短语:“引发”译作give rise to;“食品安全”译作food security/safety。
