11: ____________ the experiment several times, the scientists finally succeeded in developing a new vaccine.

`text{Đáp án:}`

`text{A. Having carried out}`

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Question

11: ____________ the experiment several times, the scientists finally succeeded in developing a new
vaccine.
A. Having carried out B. Have been carried out
C. Have carried out D. Have been carrying out
GẤP LẮM RÙI CẢ NHÀ ƠI, CÍU EM VỚI

thanhha · Answer

C11:   A.Having carried out   Ch&uacute;c bạn học tốt

mytam · Answer

11: ____________ the experiment several times, the scientists finally succeeded in developing a new vaccine.     `text{Đ&aacute;p &aacute;n:}`     `text{A. Having carried out}`

11: ____________ the experiment several times, the scientists finally succeeded in developing a new vaccine. A. Having carried out B. Have been carrie

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