问题
单项选择题
A vessel may be unable to take proper and effective action due to the speed（）too high or，in some circumstances，too low.
A.is
B.is to be
C.will be
D.being
答案
参考答案：D
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A vessel may be unable to take proper and effective action due to the speed（）too high or，in some circumstances，too low.
A.is
B.is to be
C.will be
D.being
参考答案：D