Question

Every year, the coal workers         their lungs X-rayed to ensure their health.

A．are having

B．have had

C． have

D．had had

Answer 1

C

考查时态题。根据时间状语every few years,可判断本句应为一般现在时，have lungs X-rayed意思是“请人检查肺”。因此答案选C。