CHUYÊN ĐỀ 23: TỪ NỐI (LINKING CONJUNCTIONS)
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.…………we got to the concert hall, all the good seats had been sold. A. While B. By the time C. Since D. Unless

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.…………we got to the concert hall, all the good seats had been sold.

While

By the time

Since

Unless

Giải thích

Chọn B