问题
单项选择题
How many life buoys（）on board with self-igniting light?
A.there exist
B.there is
C.there are
D.are there
答案
参考答案：D
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How many life buoys（）on board with self-igniting light?
A.there exist
B.there is
C.there are
D.are there
参考答案：D