–Has your father returned from Africa yet?

–Yes, but he _____here for only three days before his company sent him to Australia.

A．has been

B．will be

C．would be

D．was

淤血器官的形态特征是

A．色暗红，体积增大，切面湿润，功能增强，温度降低

B．色暗红，体积缩小，切面干燥，功能增强，温度降低

C．色暗红，体积增大，切面湿润，功能减退，温度降低

D．色鲜红，体积增大，切面干燥，功能减退，温度降低

E．色鲜红，体积缩小，切面湿润，功能增强，温度降低