【題目】Some theories believe ____ quality input ensures quality output in English learning.

A. how

B. that

C. why

D. what

【答案】B

【解析】

考查賓語從句。句意：一些理論認為在英語學習方面高質(zhì)量的輸入確保了高質(zhì)量的輸出。句中that引導的賓語從句that quality input ensures quality output in English learning做動詞believe的賓語，that在句中不充當任何成分，也沒有任何含義，可以省略。故B項正確。

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