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By the first decade of the 21st century, international commercial air traffic is
By the first decade of the 21st century, international commercial air traffic is
游客
2023-11-19
40
管理
问题
By the first decade of the 21st century, international commercial air traffic is expected ______beyond today’s levels.
选项
A、to have extended
B、to be extending
C、being extended
D、having been extended
答案
A
解析
非谓语动词。动词expect搭配不定式结构,表示“预计、预期”;by the first decade这个时间状语表示应该使用完成时态,所以正确答案为A。
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