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單項(xiàng)選擇題

When the changing of a VHF channel / frequency is accepted，say（）.

A.I am going to change to VHF channel
B.I am certainly going to change to VHF channel
C.Changing to VHF channel
D.VHF channel. has been changed

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單項(xiàng)選擇題

Our company is a professional one，and you may rely（）it.

A.on
B.in
C.at
D.up