1、The country has already sent up three unmanned spacecraft ,the most recent _____ at the end of las

题目

1、The country has already sent up three unmanned spacecraft ,the most recent _____ at the end of last March.
A has been launched B having been launched 为什么啊 我觉得是A啊
2_____different life is today from ______it used to be ten years ago.
A How what B what that A 我选B 刚好反调 我郁闷 为什么啊
3 By serving others,a person focuses on someone other then himself or herself ,____can beivery eyeopening and rewarding.
填的是which 为什么不是who 先行词不是a person
4 Their goods are exchanged for such machinery and equiment_____we need tobuy abroad.
as 为什么不用that 是不是as指的是像前面提到的一类物品 而that 指的是前面提到的同一物品啊

答案

前面是逗号一句话每完,一句话中不能有俩动词
宾语从句,from介词后是宾语
which指代be serving others这件事不指人
后面句子缺成分用as（buy缺宾语）