The deadbolt is the best lock for entry doors because it is not only inexpensive but installation is easy.

48/50

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

The deadbolt is the (A) best lock for entry doors (B) because it is (C) not only inexpensive but (D) installation is easy.

best

because

not only

installation is easy

Giải thích

Chọn D

Instalation is easy -> also instalation is easy

Dịch câu: Khóa then là loại khóa tốt nhất cho cửa ra vào vì nó không chỉ không đắt mà còn lắp đặt dễ dàng.