It is important that the water （） very often as this can lead to increased deposits.<br>A:not be changed<br>B:be changed<br>C:should not be changed<br>D:should be changed

It is important that the water （） very often as this can lead to increased deposits.
A:not be changed
B:be changed
C:should not be changed
D:should be changed

出自：海船船员证

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