It is very necessary that each cylinder （） before the charged air is compressed.<br>A:is scavenged<br>B:has been scavenged<br>C:be scavenged<br>D:was scavenged

It is very necessary that each cylinder （） before the charged air is compressed.
A:is scavenged
B:has been scavenged
C:be scavenged
D:was scavenged

出自：海船船员证

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