After the patients went into the office,__working. 
#83891
A
only a doctor did they see
B
only a doctor saw they
C
only a doctor they saw
D
only a doctor had they seen
推荐题目
He broke his legs while _____. 
#84532
A
riding
B
ride
C
was riding
D
rode
The president was so absorbed in his work that not a sound ______. 
#82215
A
did she dare to make
B
dared she to make
C
she dared make
D
she did dare to make
Not until World War II ______ to use new chemical techniques to purify penicillin.
#81196
A
they managed
B
that they managed
C
did they manage
D
they didn’t manage