1200 câu Trắc nghiệm tổng hợp Tiếng anh 10 - iLearn Smart World - Phần 4: Writing (có đáp án)

The first rocket flight happened in 1926. It marked the beginning of the space age. → .............................

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Combine the following sentences without changing the meaning.

The first rocket flight happened in 1926. It marked the beginning of the space age.

→ .............................

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Giải thích

The first rocket flight, which happened in 1926, marked the beginning of the space age.