these are the only good books ___on this subject.A there are B there be此类型only后面不是应该用单数吗?

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thesearetheonlygoodbooks___onthissubject.AthereareBtherebe此类型only后面不是应该用单数吗?thesearetheonlygoodbooks

these are the only good books ___on this subject.A there are B there be此类型only后面不是应该用单数吗?
these are the only good books ___on this subject.
A there are B there be
此类型only后面不是应该用单数吗?

these are the only good books ___on this subject.A there are B there be此类型only后面不是应该用单数吗?
注意前面的there are和后面的books,are和books就说明了是复数了.
这句话的意思是:这些是仅有的关于这个主题的不错的书.
到底动词用单数还是复数,关键还得看名词主语是单数还是复数.