24.Sending ____ "special delivery" costs about 15 times as much as sending it "regular delivery."A.a mail B.mails C.a piece of mail D.pieces of mailmail不可数吗?

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24.Sending ____

24.Sending ____ "special delivery" costs about 15 times as much as sending it "regular delivery."A.a mail B.mails C.a piece of mail D.pieces of mailmail不可数吗?
24.Sending ____ "special delivery" costs about 15 times as much as sending it "regular delivery."
A.a mail B.mails C.a piece of mail D.pieces of mail
mail不可数吗?

24.Sending ____ "special delivery" costs about 15 times as much as sending it "regular delivery."A.a mail B.mails C.a piece of mail D.pieces of mailmail不可数吗?
C
不可数.
根据后文的it,所以不能选D

是,不可数

a