Đề kiểm tra giữa học kì 1 Tiếng Anh 10 có đáp án- Đề 2

The concert was exciting at the beginning, ___________ it became boring at the end.

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The concert was exciting at the beginning, ___________ it became boring at the end.

so

for

and

but

Giải thích

Chọn đáp án D