The students didn.t manage to work out the problem ______ their teacher had explained how. 选项: A:when B:until C:unless D:as

The students didn.t manage to work out the problem ______ their teacher had explained how.
选项:
A:when
B:until
C:unless
D:as

出自：河南科技大学大学英语3(专升本)

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