问题

The teacher told us to remain silent unless _______.
A:to be asked
B:asked
C:being asked
D:you asked;
B:asked
C:being asked
D:you asked;
正确答案是:
同类题型
One of our rules is that every student ____ wearschool uniform while at school.
known to us all,failure usually ______ laziness while diligence can________ success.
Did Mary come to your birthday party?–No. I __________ her, but she was away on business.
Frank was ______ excited ______ he could not say anything when he saw his hero.