单选题
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】[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)，因此变为被动语态就成了本题的commercial traffic is expected to have extended beyond today"s levels。