What are common known as “lead” pencils are not lead, but rather a mixture of graphite, clay and wax.

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

What are common (A) known as “lead” pencils are not (B) lead, but (C) rather a mixture of graphite, clay and wax. (D)

common

not

but

and wax

Giải thích

Đáp án : A

“common” -> “commonly”. Phía trước có động từ tobe, phía sau có động từ dạng phân từ II, nên Ở đây ta cần một trạng từ