The changes in the channel’s sands and buoys on this coast are（）this chart can not be considered as a safe guide of the channel.<br>A:frequent<br>B:so frequent<br>C:frequent that<br>D:so frequent that

The changes in the channel’s sands and buoys on this coast are（）this chart can not be considered as a safe guide of the channel.
A:frequent
B:so frequent
C:frequent that
D:so frequent that

出自：海船船员证

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