We don’t allow ____ in the office. But you are allowed ______ in the open air. 
#96186
A
smoking; smoking
B
to smoke; to smoke
C
smoking; to smoke
D
smoke; smoking
推荐题目
 As the immune system weakens, it loses the ability ________ illnesses.
#88514
A
fighting
B
fought
C
to fight
D
to be fought
She pretended _______ me when I passed by. 
#98790
A
not to see
B
not seeing
C
to not see
D
having not seen
 I am too glad _____ you.
#98291
A
to see
B
seeing
C
saw
D
at seeing