选B stays .
1.the river,是第三人称单数,后面的动词需加S,排除A remian D.become
2.remian 和 stay：表继续停留”或“继续保持某种状态、.”remain 常可与stay 互换.
3.表示“需要设法才能保持或处于某种状态”时,才用keep.排除C.keeps
例：She knew he must keep calm.
所以选B stays
it is March now,but the river still __ frozen .A remian B st
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