He tried to ______ up his lessons by telling a few jokes.

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问题 He tried to ______ up his lessons by telling a few jokes.

选项 A、raise
B、stimulate
C、inspire
D、liven

答案D

解析 (liven使活跃起来，与up连用)。句意为：他讲了几个笑话，力图让课堂气氛活跃起来。A．raise提高；B．stimulate刺激；C．inspire激励。

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