400 câu trắc nghiệm Ngữ pháp Tiếng Anh nâng cao (P7)
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I studied English for four years in high school

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I studied English for four years in high school. _______ had trouble talking with people when I was traveling in the US.

Therefore, I

Otherwise, I

Although I

However, I

Giải thích

Đáp án D   

Therefore = bởi vậy      

Otherwise = nếu không

Although = mặc dù       

However = tuy nhiên