The reason       he didn’t go to school yesterday was       he was ill.
#78221
A
why;that
B
that;because
C
that;that
D
for which;what
推荐题目
He gave us another piece of advice, ________ of great help to the research work. 
#77225
A
which I think is
B
which I think it is
C
I think which is
D
I think it is
The reason ________ he didn’t come is ________ he was ill. 
#75222
A
why;that
B
that;why
C
why;because
D
why;what