The light bulb ( ) in the dark.A.IS used as seeing B.is used for seeing

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The light bulb ( ) in the dark.A.IS used as seeing B.is used for seeing
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The light bulb ( ) in the dark.A.IS used as seeing B.is used for seeing
The light bulb ( ) in the dark.A.IS used as seeing B.is used for seeing

The light bulb ( ) in the dark.A.IS used as seeing B.is used for seeing
B
as是用作,for是用于

B
is used for
用于;被用于做某事

b 用于;被用于做某事