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By the first decade of the 21st century, international commercial traffic is expected to _______ vastly beyond today's levels.
网校学员微信用**在学习英语零基础直达大学六级全能畅学卡【现金奖励班】时提出了此问题，已有1人帮助了TA。
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AnnieGuo0909
同学你好，该知识点来自沪江网校《英语零基础直达大学六级全能畅学卡【现金奖励班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。
同学好：expect (sb./sth.) to do 结构中，to do 不定式可以根据具体情况使用它的一般式、进行式或者完成式。
如上例，时间状语是by the first decade of the 21st century “截止到21世纪的第一个十年”【这通常是完成时的时间状语】，再结合整体句意，“截止到21世纪的第一个十年，国际商业航空运输预计将超过今天的水平”，到某个时间点将完成某事，因此用to do 的完成式to have done。
祝学习愉快！
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英语零基础直达大学六级全能畅学卡【现金奖励班】
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