【原创】The workers in the Huashan Mountain have to _______ rubbish to keep the mountains clean.
| A．turn up | B．pick up | C．mix up | D．give up |
【原创】The workers in the Huashan Mountain have to _______ rubbish to keep the mountains clean.
| A．turn up | B．pick up | C．mix up | D．give up |
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