—Jim, do you know the reason _____ Bob kept silent durin Wap版

试题详情及答案解析

—Jim, do you know the reason _____ Bob kept silent during the discussion?
—I guess he was thinking about his sick dog. It might be dying.

A．why

B．what

C．where

D．which

答案：A

试题分析: 句意：--你知道在讨论期间鲍勃一直保持沉默的原因吗？--我猜想他正在考虑他那生病的狗，可能快死了。B什么；C哪；D哪个；这里是定语从句，先行词是reason，后用why引导。故选A。
考点：考查不定式。