657._______,the sun was rising in the east.
A.Arriving there
B.We arriving there
C.Having arrived there
D.We arrived
658.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
C.being launched
D.to be launched
657.答案是B;考查独立结构。此处having been arrived为独立结构，作状语，相当于when we arrived there。
658.答案是B;考查独立结构。此处having been launched还可改成launched。
