【题目】—Why did the toy dog stop barking?
—The battery must have ________.
A. used upB. run out
C. given upD. put out
在线课程【答案】B
【解析】
考查动词短语辨析。句意：——为什么玩具狗不叫了？——电池肯定没电了。A. used up用完；B. run out用完；C. given up放弃；D. put out扑灭，熄灭。use up为及物动词短语，而run out为不及物动词短语，分析句子可知，本句需用不及物动词短语，故选B项。