The bedplate must be flexible enough to hog and sag with the foundation plate （） it is attached and which forms part of the ship’s structure.<br>A:in which<br>B:on which<br>C:to which<br>D:by which

The bedplate must be flexible enough to hog and sag with the foundation plate （） it is attached and which forms part of the ship’s structure.
A:in which
B:on which
C:to which
D:by which

出自：海船船员证

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