are doing
注：try one's best = do one's best 尽力
The firemen are trying their best to put out the big fire now.同义句转换
The firemen are trying their best to put out the big fire now.同义句转换
转化成这种形式The firemen—— —— their best to put out the big fire at that time.
转化成这种形式The firemen—— —— their best to put out the big fire at that time.
英语人气：852 ℃时间：2019-09-29 04:40:51
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