问题
选择题
They put their books____to make the library clean and tidy.
A．under the chair
B．on the floor
C．behind the door
D．in the bookcase
答案
答案：D
题目分析：句意：他们把书放进书柜里，让图书室又干净又整洁。A椅子下B地板上C门后面D书柜里，因为书要放在书柜里才显得整洁，故选D。
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