---it is expensive or not is an important questionA whether B that C if D how

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---it is expensive or not is an important questionA whether B that C if D how
---it is expensive or not is an important question
A whether B that C if D how

---it is expensive or not is an important questionA whether B that C if D how
A
选择性从句一定要用wether来引导
它昂贵与滞是个很重要的问题
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