He expressed a hope _______ he would visit China again the next year, and this was the very hope _______ he would express as soon as he arrived in the country.

A．that; that

B．which; which

C．that; which

D．which; that

血、尿中尿素测定的方法有（）

A．酶偶联法

B．次氯酸盐显色法(波氏法)

C．二乙酰一肟法

D．双缩脲法

E．电泳法