中文谷Theyrecommendedthatadultsuseheadsetsorspeakerphonesand...
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问题详情：
They recommended that adults use headsets or speaker phones and _______ children and teens, whose brains tissues are still developing, use cell phones only for emergencies.
A. that B. / C. while D. what
【回答】
A
知识点：连词
题型：选择题
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