---Arethese________?---Yes,theyare.A.pencilcaseB.pencilcasesC.pencilscaseD.

发布时间：2020-08-06 20:49:55

---Are these ________?
---Yes, they are.A.pencil caseB.pencil casesC.pencils caseD.pencils cases

网友回答

B解析pencil case的复数在case后加s。
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