问题描述：
It was ____problem that ____ of the students could work it out .
A.so hard a ;a few
B.so hard a ;few
C.such hard a;few
D.such a hard; a few
A.so hard a ;a few
B.so hard a ;few
C.such hard a;few
D.such a hard; a few
问题解答：
我来补答展开全文阅读