单选题7.By the first decade of the 21st century, international commercial air traffic is expected______ vastly beyond today's levels.
【正确答案】
A
【答案解析】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 traffic is expected to have extended beyond today’slevels。