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weather与if的差别
人气:467 ℃ 时间:2020-03-26 20:15:26
解答
1.if和whether在宾语从句中,都表“是否”,可换用,if更口语化,whether正式些.当有or not时, 一般用whether,而不用if.He wants to know if/whether you can help him.She wonders whether you'll go or not.2.if可引起...
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