He has written several books,but his last works ___ well kno
He has written several books,but his last works ___ well known among his friends.
[A] Have
[B] Have been
[C] Is
[D] Are
请给出答案并翻译中文,
[A] Have
[B] Have been
[C] Is
[D] Are
请给出答案并翻译中文,
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