虚拟语气的初步用法 — 英语选择题
题目
人类现在没有鳃（gills），也不能在水下呼吸。选择表达这一假设及其可能结果的句子。A. If humans have gills, they can breathe underwater. B. If humans had gills, they could breathe underwater. C. If humans would have gills, they could breathe underwater. D. If humans had gills, they can breathe underwater.