单选题 The main difficulty lies in the fact ______ we have nobody properly qualified for this work.
【正确答案】 B
【答案解析】[解析] 本题考查同位语从句的用法。引导词that在同位语从句中是连词,只起连接作用,不在从句中作任何成分,that不可省略。故答案为B。