题干

Tom, as well as his father,  in the sea when he heard someone calling for help just ahead of him.
A.had swumB.has swum
C.was swimmingD.is swimming
上一题 下一题 0.64难度 单项选择 更新时间:2014-12-17 07:40:43

答案(点此获取答案解析)