By the first decade of the 21st century, international commercial air traffic is

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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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