The emergency communication set’s transmitter should not be tested except when（）by a public radio inspector.<br>A:inspecting<br>B:inspected<br>C:inspects<br>D:having inspected

The emergency communication set’s transmitter should not be tested except when（）by a public radio inspector.
A:inspecting
B:inspected
C:inspects
D:having inspected

出自：海船船员证

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