A high-speed此处考查第一点建议:“1.When undertaking Internet-based activities,a high-speed Internet connection is essential.”,即开展网络活动时,一定要

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答案A high-speed

解析 此处考查第一点建议:“1.When undertaking Internet-based activities,a high-speed Internet connection is essential.”,即开展网络活动时,一定要具备高速的网络连接,故填入A high-speed,注意首字母要大写。
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