19.The students didn’t manage to work out the problem ______ their teacher had explained how.

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• The students didn’t manage to work out the problem ______ their teacher had explained how. A. when B. until C. unless D. as1. Some people think ______ about their rights than about their duties. A. too much B. as much C. much more D. many more
• 19.The students didn’t manage to work out the problem ______ their teacher had explained how.
• The students didn't manage to work outthe problem ______their teacher had explained how.为什么不是unless而是until
• The students didn’t manage to work out the problem ______ their teacher had explained how.
• 19.The students didn’t manage to work out the problem ______ their teacher had explained how.
• The students didn't manage to work outthe problem ______their teacher had explained how.
• 写出下面句子的同义词.
• ,idea ________ to be true.A.turned out B.turned on C.turned off D.turned up