After the spaceship Soyuz be in orbit around the earth Pham Tuan and Viktor Gorbatko conduct some experiments

Câu hỏi :

After the spaceship Soyuz 37 (be) __________ in orbit around the earth, Pham Tuan and Viktor Gorbatko (conduct)_________ some experiments.

* Đáp án

* Hướng dẫn giải

Đáp án: had been – conducted

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