单选题 ______information provided by members of the public, the police would have a much move difficult job.
【正确答案】 C
【答案解析】句意：要不是因为民众提供的信息，警察的工作可能会更加困难。if it were not for要不是。使用该句型时，从句使用虚拟语气。supposing假设，假如。provided that如果，倘如。on condition that在…条件下；如果。