How can I ever concentrate if you ________ continually ________ me with silly questions? 
#104794
A
have…interrupted
B
had interrupted
C
are…interrupting
D
were…interrupting
推荐题目
 He ___________busy yesterday, or he __________you with your experiment.
#100168
A
was; had helped
B
was; would have helped
C
had been; would have helped
D
were; would have helped
--Look! Someone ________ the floor.--Well, it wasn’t me. I went shopping just now. 
#100635
A
had swept
B
has swept
C
was sweeping
D
is sweeping