We must keep the noise under 50dB（分贝） here.The noise must __

We must keep the noise under 50dB（分贝） here.The noise must ______ ______under50dB here

fengoverlove 1年前已收到1个回答举报

qq450105361 幼苗

共回答了21个问题采纳率：85.7% 举报

e kept
be controlled
变为被动语态吗?

1年前追问

fengoverlove 举报

是的

举报 qq450105361

那就是了 be kept be controlled 都可以

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你能帮帮他们吗

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