So difficult ____that no one could ___ a good solution to it.
A.was the problem; come up with |
B.the problem was; come up with |
C.the problem was; put up with |
D.was the problem; put up with |
相关知识点
推荐套卷
So difficult ____that no one could ___ a good solution to it.
A.was the problem; come up with |
B.the problem was; come up with |
C.the problem was; put up with |
D.was the problem; put up with |