It is necessary to examine this claim（ ）we proceed any furtherbefore until when since 2.his work( ),he left his office with joy.A finished B being finished C finishing D was finished应该选哪个？
问题描述：
It is necessary to examine this claim（ ）we proceed any further
before until when since
2.his work( ),he left his office with joy.
A finished B being finished C finishing D was finished
应该选哪个？
答
第一题是before
第二题是finished
答
before
finished