Rain is pouring down from the sky without any sign of stopping．Farmers begin to worry about their crops since it _____ as long as 24 hours．

         A．would rain              B．had rained             C．was raining             D．has been raining

Rain is pouring down from the sky without any sign of stopping．Farmers begin to worry about their crops since it _____ as long as 24 hours．

1. A.
   would rain
2. B.
   had rained
3. C.
   was raining
4. D.
   has been raining

Rain is pouring down from the sky without any sign of stopping．Farmers begin to worry about their crops since it _____ as long as 24 hours．

       A．would rain      B．had rained       C．was raining      D．has been raining

Rain is pouring down from the sky without any sign of stopping．Farmers begin to worry about their crops since it         as long as 24 hours．

A．has been raining          B．had rained           C．was raining         D．will rain

Rain is pouring down from the sky without any sign of stopping．Farmers begin to worry about their crops since it _____ as long as 24 hours．