“Isitfreewiththiscertificate?”以下最适合的回答（） A: Yes，youwill. B: Sorry，it’snotvalidonsubwaytrains. C: Yes，Ican. D: Sorry，Idon’tknow.
“Isitfreewiththiscertificate?”以下最适合的回答（） A: Yes，youwill. B: Sorry，it’snotvalidonsubwaytrains. C: Yes，Ican. D: Sorry，Idon’tknow.
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