Seldom________games been of practical use in playing real games

Câu hỏi :

Seldom________games been of practical use in playing real games.

A. do theories of mathematics

B.have theorized as mathematics 

C. has the mathematical theory of

D. the mathematical theory has

* Đáp án

* Hướng dẫn giải

 Đáp án là C. Đảo ngữ: Seldom + has/have + S + PII.: hiếm khi….

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