The newly-built sound lab will be ______ next term so that the students will be

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问题 The newly-built sound lab will be ______ next term so that the students will be easily understood the mechanism of echo.

选项 A、put in use
B、in use
C、put into use
D、for use

答案 C

解析题意是：新建成的声音实验室将在下学期______。这样学生们就能很容易理解回声的原理。[C]put into use“投入使用”，符合题意。[A]put in use，介词用法错误；[B]in use“在使用中”，[D]for use“为使用”都与题意不符。

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