if it___tomorrow,we'll go swimming.选择A.isn't rain B.doesn't rain.为什麽答案是B 而不是A?不是都是助动词吗?如果是Charlie____ here next month？A.isn‘t coming B.doesn’t come 选什麽呢？
问题描述：
if it___tomorrow,we'll go swimming.选择A.isn't rain B.doesn't rain.为什麽答案是B 而不是A?
不是都是助动词吗?
如果是Charlie____ here next month？A.isn‘t coming B.doesn’t come 选什麽呢？
答