In the sentence "The books in the study must be kept in good order" the italicized parts
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In the sentence "The books in the study must be kept in good order", the italicized parts is an additional explanation of
A．the subject.
B．the predicate.
C．the object.
D．prepositional phrase.
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正确答案：A
介宾短语ingoodorder在句中作主语补足语，是对主语Thebooks的补充说明，缺少这一部分句子表达则不完整，因此答案为A。如果一时判断不了，可将句子还原为主动语态Wekeepthebooksinthestudyingoodorder．其中ingoodorder作宾语thebooks的补语，在题干被动语态中Thebooks变成主语，相应地ingoodorder是主语补足语。