I didn’t manage to work out the problem______the teacher had explained how.A、unt

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问题 I didn’t manage to work out the problem______the teacher had explained how.

选项 A、until
B、unless
C、when
D、before

答案 A

解析本题考查连词的用法。until的意思是“直到…才…”，unless表示的意思是“除非…”，when的意思是“当…时候”，before的意思是“在…之前”。故正确的答案为A。

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