they are wondering __to improve their englishA 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

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they are wondering __to improve their englishA 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
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they are wondering __to improve their englishA 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
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 englishA 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

选D,他们想知道应该怎么做才能提高他们的英语。
这是个宾语从句,从句用陈述句语序,首先排除C;选项A、B从句中只有情态动词should不能独立做谓语,因此从句缺乏谓语,排除A/B

选D
下列括号中为正确形式:
A. they are wondering (if they should do something)to improve their english
do后面缺宾语,需要+something
B. they are wondering (what they should do)to improve their english
...

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选D
下列括号中为正确形式:
A. they are wondering (if they should do something)to improve their english
do后面缺宾语,需要+something
B. they are wondering (what they should do)to improve their english
should后面缺谓语,需要+do,相当于“they should do what”
C. they are wondering (how they should do)to improve their english
宾语从句要用陈述语序 how they should do
D. they are wondering (how they should do)to improve their english
D是正确的

收起

此题为从句问题
把句子调整 how should they do to improve their english
还原时注意语序问题(是不是倒装)
故答案为D