问题补充:
单选题TheworkersintheHuashanMountainshavetorubbishtokeepthemountainsclean.A.turn upB.pick upC.mix upD.give up
答案:
B解析难度适中,考查词组的意思,turn up出现,发生,pick up拾起,收拾mix up混淆,弄混,give up放弃,
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