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  • This is the first time astronomers ____the whole process of a black hole ___a star, from its first

    This is the first time astronomers ____the whole process of a black hole ___a star, from its first
    to nearly final bites.
    A see eat B have seen eatingC saweatenD had seeneat
    這個句式是不是用完成時呢?
    英語人氣:380 ℃時間:2020-10-01 08:11:38
    優(yōu)質(zhì)解答
    是用現(xiàn)在完成時
    It/This is the first/second/……/last time that +現(xiàn)在完成時
    It/This was the first/second/……/last time that +過去完成時
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