单项选择题

When asked to explain what has happened, John was totally at a loss for words.

A．近年来人们对于控制会议长度的方法提出了很多想法。
B．最近几年来人们对于如何减少会议数量提出了很多意见。
C．近年来人们对于控制会议长度的方法考虑了很多。
D．如何在最近几年内减少会议数量是很多人都曾考虑过的问题。
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