It rining heavily

It rining heavily It rining ( ) A.heavy B.heavily C.too heavy what is open when it is rining It is s------- heavily. it rained heavily的heavily 为什么在后面? It is rainy heavily?还是It is rains heavily? It is rainging heavily=It rains heavily It is snowing heavily (介词) It rained heavily last night. 英译汉;"It is raining heavily." It is s____ heavily now. It is___?___ heavily now.