Some people feel easy and comfortable to be served by others but when they are asked to serve others ______, they are unwilling or even hate to do so. 
#27508
A
in turn
B
in their turns
C
in their turn
D
by their turn
推荐题目
You have made a few mistakes in your composition but _______ you have done well.
#26709
A
on the whole
B
first of all
C
on the other hand
D
in a word
_____ writer, she is excellent, _____ teacher she is not very good.
#28555
A
As; but as
B
As; and as
C
As a ; but as a
D
As a; and as a