单选题 As a new graduate, he doesn"t know ______ it takes to start a business here.
【正确答案】 B
【答案解析】[解析] 分析句子结构可知，know后为宾语从句，take是及物动词，所以应用连接代词what引导从句，what在从句中作takes的宾语。故选B。