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病毒分为三大类:______、______、______.它的结构组成是______和______.
1年前
The ____________man can carry some water every day.
1年前
天空中有很多乌云,似乎要下雨了。 There are many black clouds in the sky, It_________rain.
1年前
Will you fix up the machine according to the ______, David ?
1年前
He seldom listens to others. He_____answer for what he has done.
1年前