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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
2025-04-01
11
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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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