The scavenging box is built of a number of sections provided with vertical flanges enabling them （） together to form two blocks.<br>A:being bolted<br>B:bolted<br>C:bolting<br>D:to be bolted

The scavenging box is built of a number of sections provided with vertical flanges enabling them （） together to form two blocks.
A:being bolted
B:bolted
C:bolting
D:to be bolted

出自：海船船员证

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