题干
As a new graduate，he doesn't know ________ it takes to start a business here. （ ）
A：how
B：what
C：when
D：which
答案(点此获取答案解析）
B
As a new graduate，he doesn't know ________ it takes to start a business here. （ ）
A：how
B：what
C：when
D：which
