30．When you finish your work, don’t forget to put the tools back where they ________．
A．a(chǎn)reB．will beC．wereD．had been
C
考查動(dòng)詞時(shí)態(tài)。把工具放在原處。既然是原來所在的地方，很顯然時(shí)態(tài)應(yīng)為過去式。
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