问题补充：
30．When you finish your work, don’t forget to put the tools back where they ．
A. are
B. will be
C. were
D. had been
答案：
A. are
B. will be
(答案→)C. were
D. had been
解析：考查动词时态。把工具放在原处。既然是原来所在的地方，很显然时态应为过去式。
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