2. 外语
  3. By the first decade of the 21st century, international commercial air traffic is expected______ vastly beyond today’s levels.

By the first decade of the 21st century, international commercial air traffic is expected______ vastly beyond today’s levels.

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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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