Among these books( )an English novel that his mother gave him as a birthday gift

问题描述:

Among these books( )an English novel that his mother gave him as a birthday gift
A are included B is included
C have included D has included
为什么选B不选A?
怎么看出是倒装?

介词短语位于句首倒装,正常语序是a book is included among these books 主语是第三人称单数,谓语动词是is倒装之后还用is主语不是these books