This dictionary is very useful. It has ___ many problems about words and idioms for me.
#81986
A
looked up
B
kept up
C
taken up
D
cleared up
推荐题目
The accident      to the man who        to be a foreigner, so it was hard to deal with.
#72744
A
occurs; happened
B
happened ;occurred
C
came about; occurred
D
occurred ;happened
The extra room _______ very useful when we had visitors.
#70883
A
was proved
B
proved
C
has been proved
D
has proved