He spends much time s___ the differences between American and British English.

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He spends much time s___ the differences between American and British English.
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He spends much time s___ the differences between American and British English.
He spends much time s___ the differences between American and British English.

He spends much time s___ the differences between American and British English.
studying 研究

答案是studying

solving

studying

studying

studing