a bottle of orange 是“一瓶桔汁”。
a bottle 表示“容器”概念,是无法就此提问的,所以此题无解。
如果句子不是进行时态(进行体无法表达数量概念。我们不能说:他正在喝两瓶桔汁。),把a bottle 改为one bottle,强调数量概念,而且划线部分含有of,就可以提问了。例如:
He drank one bottle of orange.
How much orange did he drink?
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这句话中的a bottle用正常的疑问句结构是无法提问的,但可以用echo question提问:
Tom is drinking a what of orange?
echo question不同于正常的疑问句,它可以对句中几乎任何成分发问,例如:
He was enthusing about the film. 提问:He was whatting about the film?
They gave it to Angela Cooke. 提问:They gave it to Angela who?
(上面两例来自The Cambridge Grammar p.888)
如果将此题理解为对喝的量进行提问,那么用How much orange juice is he drinking提问是合理的。