black c______ are a sign of rain

black c______ are a sign of rain 英语 Black c---- are a sign of rain.（根据首字母填空） a sign of rain 是什么意思? There are a lot of black clouds.It m_______ rain soon Dark clouds are a sign of rain.——这句话正确吗?为什么前面用“are”后面仍用“a si The c______ of the flood was the heavy rain The c______ of the flood was the heavy rain. There are a lot of sign in the street 改错 There are a lot of sign in the street A sign of breathe a sign of There Are many black clouds in the sky,it-----Rain soon A.wi