Water and air ( ) important.A.has B.is C.have D.are

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Water and air ( ) important.A.has B.is C.have D.are

Water and air ( ) important.A.has B.is C.have D.are
Water and air ( ) important.A.has B.is C.have D.are

Water and air ( ) important.A.has B.is C.have D.are
选D
两个主语虽然分别都是单数,但是用and连接起来之后,变成了复数主语,故选are

Water and air ( is) important. Water and air 不可数

b

D

D