Anonymous Is it optional to put 'to'? No. Omit it.
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AnonymousIs it optional to put 'to'?The rate is $200 through [to] June.I wouldn't use 'to' in that sentence. I'd say The rate [is / will be] $200 through / throughout (from the 1st till the last of) June. The sentence with 'to' seems odd to me there.