作业帮how many kinds ____ instruments are there in the music room?（填介词）
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how many kinds ____ instruments are there in the music room?（填介词）
how many kinds ____ instruments are there in the music room?（填介词）
how many kinds ____ instruments are there in the music room?（填介词）
【of】
kind of 问种类
这里是问有多少种乐器在音乐室.
果断填of