they are wondering __to improve their english
D how they should doB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
they are wondering __to improve their english
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
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
英语人气：145 ℃时间：2020-01-16 05:28:26
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