单项选择题

Which of the following sentences is INCORRECT

A.Customers are asked to ensure that they have given correct change before leaving the shop as mistakes cannot be afterwards remedied,
B.Having been given such a good chance, he planned to learn more.
C.A great many teachers firmly believe that English is one of the most poorly-taught subjects in high schools at present.
D.I"m utterly puzzled what to do with it.
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