问题

____ we admit that there are still someproblems about the system of modern education, we don’t mean that it is of nouse.

A:Until
B:While
C:As
D:Unless

正确答案是：

同类题型

“ You smoke in the bedroom”, Rose said to her hushand and pushed him out of the room.

He was a kind teacher _________ I went for advice.

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Elizabeth took up writing while she was at college and regularlythe college magazine, which benefited her later career a lot．

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