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  3. 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2025-04-01  3
问题 By the first decade of the 21st century, international commercial air traffic is expected______vastly beyond today’s levels.
选项 A、to have extended
B、being extended
C、to be extending
D、having been extended
答案 A
解析 expect后面跟带不定式的复合结构expect sb．to do sth．；如果要表示“预料在将来某个时间某人会做完某事”就应说expect sb．to have done sth．(后面跟一个表示时间的状语)，因此变为被动态就成了本题的commercial air traffic is expected to have extended vastly beyond today’s levels。
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