介词短语与名词搭配 — 英语情景题

情景对话：Sam 和 Lily 在整理教室。请从括号中选择合适的介词短语补全对话。 Sam: Lily, where is my ruler? Lily: Is it (1)________ your pencil case?（在你的铅笔盒里） Sam: No, it isn't. Lily: Look! Your ruler is (2)________ the chair.（在椅子上） Sam: Oh, yes! And where is my English book? Lily: It's (3)________ the desk.（在课桌下面） Sam: Thank you, Lily! (1) A. in B. on C. under (2) A. under B. on C. in (3) A. on B. in C. under