单选题 If they had sent a check to the telephone company last week, their telephone ______out of service at this moment.

【正确答案】 C

【答案解析】这里考查的是虚拟语气。这里是混合型虚拟语气。如果后面接了如now，then，at this moment，tomorrow等时间状语的话，那么从句的时态与时间状语一致。答案为C。