[考题] be V-ing than 后面要接?

楼主: uni1021 (小李)   2017-07-19 16:59:15
People in many parts of the world are living longer lives now than people ____ in the past.
a) did
b) were
c) lived
d) had been
答案是a
想请教题目里,than之前的部分,动词是? are living? lives?
承上题,如果动词是 are living,did和were怎么选?
谢谢
作者: zebracoco (公子吃丙)   2017-07-19 17:58:00
than people ( in many parts of the world ) lived inthe past . lived 和前面动词一样,所以用did 代替

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