These flowers ___.Let's get some water .A.need to watered B.need watering C.have need watered D.are watering ,为什么?

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These flowers ___.Let's get some water .A.need to watered B.need watering C.have need watered D.are watering ,为什么?

These flowers ___.Let's get some water .A.need to watered B.need watering C.have need watered D.are watering ,为什么?
These flowers ___.Let's get some water .
A.need to watered B.need watering C.have need watered D.are watering
,为什么?

These flowers ___.Let's get some water .A.need to watered B.need watering C.have need watered D.are watering ,为什么?
need to be done =need doing sth.
A应为need to be watered 少be
C时态 语态都不对,应用一般现在时
D语态应改为被动
故只有B对

need doing固定句式啊~~