It__outside.You'd better take an umbrella with youA.rainsB.is raining C.rainedD.has rained 为什么

It__outside.You'd better take an umbrella with youA.rainsB.is raining C.rainedD.has rained 为什么
It__outside.You'd better take an umbrella with you
A.rains
B.is raining
C.rained
D.has rained 为什么

It__outside.You'd better take an umbrella with youA.rainsB.is raining C.rainedD.has rained 为什么
答案是 C的话说明答案有错误,既然后面You'd better take an umbrella with you (你最好带上雨伞）,说明外面正在下雨,应该用现在进行时（be doing的结构）,所以答案一定是B.
A是一般现在时
C 一般过去时
D 现在完成时

rain下雨，这个动作正在进行，所以用现在进行时，
选B
选C的话时下过雨，动作一完成