Don’t go out. It hard.A. rainB. rainsC. is rainingD. are raining

问题补充：

Don’t go out. It hard.

A. rain

B. rains

C. is raining

D. are raining

答案：

A. rain

B. rains

(答案→)C. is raining

D. are raining

解析：根据第一句内容Don’t go out，用现在进行时，故选答案为C。