Mark the letter A, B, C or D on your answer sheet to indicate the sentences that best combines each pair of sentences in the following questions. (Tô phương án A, B, C hoặc D trên phiếu TLTN

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Mark the letter A, B, C or D on your answer sheet to indicate the sentences that best combines each pair of sentences in the following questions. (Tô phương án A, B, C hoặc D trên phiếu TLTN tương ứng với các đáp án đúng để nối hai câu dưới đây thành một câu hoàn chỉnh).

Mai is very helpful. She usually helps her classmates with their studies.

Mai is very helpful, so she usually helps her classmates with their studies.

Mai is very helpful, but she usually helps her classmates with their studies.

Mai is very helpful, or she usually helps her classmates with their studies.

Mai is very helpful; however, she usually helps her classmates with their studies.

Giải thích

A. Mai is very helpful, so she usually helps her classmates with their studies.