Every year, the coal workers         their lungs X-rayed to ensure their health. 
#101931
A
are having
B
have had
C
have
D
had had
推荐题目
-What a dry day!-We _______ such dry weather for almost twenty days.
#104440
A
have
B
have had
C
have been having
D
have been had
—Where is Tom? — Well, he ______ you ______ here.Otherwise he would come down right now.
#103207
A
didn’t know; were
B
hasn’t known; are
C
doesn’t know; are
D
hadn’t known; were