Mr. Smiths was busy writing a story, only ______ once in a while to smoke a cigarette.
#88541
A
to stop
B
to have stopped
C
being stopped
D
stopping
推荐题目
Don’t forget to examine the test paper you have just finished_____the possible mistakes in it .
#96084
A
correcting
B
to correct
C
and corrected
D
having correcting
The operation I had   just two months ago and now I have fully recovered.
#92537
A
taken place
B
took place
C
to take place
D
taking place