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
The idea suddenly______me is that we should go outing.
#98484
A
struck
B
striking
C
appearing
D
appeared
—Hi, Lydia. Are you going to the concert on Friday?—I’d like to. But there are so many problems_______.
#95338
A
remaining to be settled
B
remained settling
C
remaining to settle
D
remained to be settled