Now Sue ___________ do the dishes every day.
A:have to
B:has to
C:had to
在CH3COOH 与CH3CH218OH 酯化反应后的生成物中,18O存在于( )
Name
Age
Height
Weight
Sarah
11
1.52 metres
35 kilograms
Liu Yun
13
1.60 meters
41 kilograms
Mike
10
1.65 meters
40 kilograms
参考句型: Sarah is . . . than Liu Yun. Liu Yun is . . . than Mike.