____in the quence for half an hour,tom suddently realized that he had left his wallet at home.A having waited B to have waited为什么不能选B?原因是什么?为什么选A?-

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____in the quence for half an hour,tom suddently realized that he had left his wallet at home.A having waited B to have waited为什么不能选B?原因是什么?为什么选A?-
____in the quence for half an hour,tom suddently realized that he had left his wallet at home.
A having waited B to have waited
为什么不能选B?原因是什么?为什么选A?
-

____in the quence for half an hour,tom suddently realized that he had left his wallet at home.A having waited B to have waited为什么不能选B?原因是什么?为什么选A?-
选A
表示持续这种等待的状态,用进行时~

这道题考察的是非谓语动词(主动形式)作状语
选A是因为已经等过了,而且是主动,Tom等的
不能用B,因为不定式通常表示动作在将来发生
而且A在语感上要顺一些~~