15:D not~until 主将从现
16：D it 是形式主语 it's to do sth.是固定句型
17;D be doing 是现在完成时 hard在这里是副词,修饰working,应放在其后
18：D 根据句意应选‘在~的开始’B短语不存在,C后不加n.而加‘,’其后再加句子
15.He won’t give up until he the problem.A.work on B.at work
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