普通话里，能同声母z、c、s相拼的一组韵母是()
A、开口呼、合口呼A
舌根音g、k、h，舌尖前音z、c、s，舌尖后音zh、ch、sh、r与舌面音j、q、x正好相反，只能跟开口呼、合口呼韵母相拼，不能跟齐齿呼、撮口呼韵母相拼。
Washerisamachine____(用它我们洗衣服)orapersonwhoiswashing.
Hepaidtheboy$10forwashingtenwindows,mostof____hadn'tbeencleanedforatleastayear.
Whatisagenerallyacknowledgedasthemostpowerfuladvertisingmediumandreachesabroadspectrumofconsumers.（）
Themanwhowasdrivingthedruckwouldnotadmitthathehadbeenatfaultand______.
题目：提高质量保证
