While _________, people sometimes can’t help buying something they don’t really need.
#91557
A
shopped
B
being shopped
C
to shop
D
shopping
推荐题目
The film star walked to his car, ______ a crowd of journalists. 
#98429
A
followed by
B
following by
C
to follow
D
to be followed by
To finish the homework, he spent four hours _______ in the study.
#97225
A
locking
B
locked
C
locked himself
D
to lock