I __________ a doctor now, if I had studied medical science imy youth.
· were
· should
· had
· should have
出自:华北水利水电大学英语

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块