单选题Mr. Smith works with&nbsp

问题补充：

单选题Mr.Smithworkswithamobilephonecompany,buthe_____________forthisinternationalmeeting,sinceheisonholiday.A.worksB.is workingC.has workedD.had worked

答案：

B解析根据since he is on holiday，说明指的是现在的情况，所以用现在进行时态。选B。