问题

The scavenging box is built of a number of sections provided with vertical flanges enablin

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

请帮忙给出正确答案和分析，谢谢！

参考答案

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