Mark the letter A, B, C, or D that needs correction: Before (A) the invention

Câu hỏi :

Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction.

A. Before

B. the printing

C. have been

D. by hand

* Đáp án

C

* Hướng dẫn giải

Đáp án C.

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