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几道英语填空题要求:合并成一句1.Light travels faster than sound.My teacher

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几道英语填空题
要求:合并成一句
1.Light travels faster than sound.My teacher has told me.
My teacher has told me ( )light ( )faster than sound.
2.Can they speak French.I want to know.
I want to know ( )they can speak French.
1. that...travels My teacher told me后接that引导的宾语从句,在表示真理时时态始终用一般现在时所以用travels
2.if/whether 表示是否
在以下情况下只能用whether
接不定式 如:I'm not sure whether to go.
介词之后 如:It depends on whether the letter arrives in time.
句型whether or not
引导主语从句 如:Whether they win or lose is all the same to me.