By the age of ten, Helen _______ Braille as well as the manual alphabet and even learned to use the typewriter

Câu hỏi :

By the age of ten, Helen _______ Braille as well as the manual alphabet and even learned to use the typewriter

A mastered

B has mastered

C had mastered

D was mastering

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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