北理工《大学英语（1）》在线作业19春(满分答案)
日期：2019-04-02 10:14:19
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(单选题)1: Don’t _____ the camera ______ unless you are sure you can put it together. 1: take … off 2: work … out 3: set … off 4: take … apart 标准选择: (单选题)2: Scientists didn’t know much about lung cancer _____. 1: before long 2:...