问题
He looks unhappy.—Yes,but he can’t say what it is_______is bothering him.
A:as
B:that
C:what
D:which
B:that
C:what
D:which
正确答案是：
同类题型
do your parents take exercise, Jim—Less than three times a week.
(2016·北京完形改编)By January 26, Billy and three other children had died. Twenty more were .
Eric felt the bag brought back by his parents, curious to know what it .
Must I turn off the gas after cooking—Of course.You can never be ________careful with that.