Don’t enter the office unless _______. 
#97222
A
you have told to
B
told to
C
telling
D
you are told
推荐题目
Though______money, his parents managed to send him to university
#90752
A
lacked
B
lacking of
C
lacking
D
lacked in
 As the mid- examination is coming , the students are busy ____ it.
#95294
A
preparing
B
prepare for
C
prepare
D
prepareing for