As a graduate, he doesn't know __________ it takes to start a business here.
A. how
B. what
C. when
D. which
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People retained their __________________________________.(做事的传统和习惯）
She went to American to _________________________.(投身演艺事业）
We will work hard to improve our ability ____________________.(执行各项政策）
He _______________________from scratch. (开了这家饭馆）
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