He quickened and ______ his walking pace as he heard the announcement in the loudspeakers that the train would leave in ten minu

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问题 He quickened and ______ his walking pace as he heard the announcement in the loudspeakers that the train would leave in ten minutes.

选项 A、prolonged
B、lengthened
C、extended
D、stretched

答案B

解析 动词辨析题。A prolong“(使时间)延长”;B lengthen“延长,加长(物体长度)”;C extend“扩充,延伸(范围)”;D stretch“舒展;拉直,拉长;展开,铺开”。根据后面的宾语his walking pace,可见这里指的是“步幅的加大”,故选B 。
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