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they are wondering __to improve their english

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they are wondering __to improve their english
A if they should do B what they should C how should they do D how they should do
请各项说明理由
B 是what they should do
they are wondering __to improve their english
D how they should do
再问: B
再答: 句子意思是:他们疑惑该怎么做来提高他们的英语。B what they should do 语序是对的,意思是 该做什么 ; D how they should do 意思是 该怎么做 选B 强调 做什么事,采取什么措施。 可能根据上下文,选择B吧 其实 D也对的