问题
ook has helped me greatly in my daily communication, especially at work ________ a goodimpression is a must.
A:which
B:when
C:as
D:where;
B:when
C:as
D:where;
正确答案是：
同类题型
professor walked onto the platform and seated himself in a chair, ______ for answering questions.
It is global warming, not other things,______ the extreme weather.
It is generally believed that teaching is _____ it is a science[ ]
You seem to like sweets.—___.That’s probably why I’m becoming fatter and fatter.