(单选题)

（）

A.unless

B.before

C.once

D.until

参考答案：C

参考解析：

考查连词辨析。句意：根据课程教材，老师应该向学生提出之前没有遇到过的问题，比如“一升牛奶的价格是多少？”以及“列出5个你完全会做的热菜”和“你离开家后多久洗一次床单？” unless意为“除非”；before意为“在……之前”；once意为“一旦”；until意为“直到”。根据上下文语境，此处只有“一旦”符合语境。故选C。

知识点：

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