It's going to rain和 It'll be raining

It's going to rain和 It'll be raining It's going to (raining,rain) it will be raining ,it will rain it's going to rain 哪个对,意思上有 it's going to raining,为什么rain要加ING Look at these clouds,___.A.It'll rain B.It's going to rain It.tomorrow.A.rains B.rained C.'s going to rain D.'s raining it happened to be raining.还是it happened to rain. what is the weather going to be?it's________A raining B rain It's going to ___tomorrow.A.rainy B.rain C.raining(选哪个） It's going to __________.A.rain B.rainy C.raining Look at these clouds.________. a.it'll rain b.it's going to it is rain 和 it 0s raining区别