Since Helen ______10 years old, she has mastered Braille as well as the manual alphabet and even learned to use the typewriter.

Câu hỏi :

Since Helen ______10 years old, she has mastered Braille as well as the manual alphabet and even learned to use the typewriter.

A. were

B. will be

C. has been

D. was

* Đáp án

D

* Hướng dẫn giải

Since + QKĐ, HTHT

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