题目内容
17．那时他在努力算出这道数学题．He was trying hard towork out this maths problem at that time．
分析 work out
解答 答案：work out．这里的空格处需要表达"算出"，用动词短语work out，前面是try to do sth表示尽力做某事，故用原形work out．
点评 这里根据所学的短语得出答案，还要瞻前顾后判断短语的正确形式
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