[audioFiles]2018m3x/audio_eyshj_040_201803[/audioFiles]A、They were common in th

游客2023-06-28 45

问题

选项 A、They were common in the United States.
B、Only a few people had them.
C、People considered them essential.
D、They were not very accurate.

答案 B

解析

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[originaltext]Acommonchallengeformanyteachersiskeepingtheirstudent