This is one of the books that ______ on this subject.A、have been writtenB、has b

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问题 This is one of the books that ______ on this subject.

选项 A、have been written
B、has been written
C、written
D、wrote

答案 A

解析

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Thelawrequiresthateveryone______hiscarcheckedatleastonceayear.A、has