Although they are an inexpensive supplier of vitamins, minerals, and high quality

Câu hỏi :

Choose A, B, C, or D to indicate the underlined part that needs correction in each of the following questions.

A. Although

B. an

C. contain

D. cause

* Đáp án

B

* Hướng dẫn giải

Đáp án B

An => x

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