Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

Câu hỏi

Yuri Gagarin made a successful space flight in 1961. Human's uncertainties about universe were enlightened only then.

Đáp án
D. Only after Yuri Gagarin had made a successful space flight in 1961 were human's uncertainties about universe enlightened.

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