this material can be used in our factory has not been studied yet. [ ] A．WhichB．
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________ this material can be used in our factory has not been studied yet.
[]
A．WhichB．WhatC．ThatD．Whether
试题答案
答案：D
________ this material can be used in our factory has not been studied yet.
[]
A．WhichB．WhatC．ThatD．Whether
答案：D