We can't decide what to do()our headteacher tells us about itA.whileB.sinceC.untilD.when 最好有讲解

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We can't decide what to do()our headteacher tells us about itA.whileB.sinceC.untilD.when 最好有讲解

我可以负责任的告诉你,答案是C.
We can't decide what to do until our headteacher tells us about it.
在校长给我们指示之前,我们不能作出决定.