It is the third time that she ______ the role of Juliet ever since she graduated from university.

A．has played

B．had played

C．is playing

D．played

下列说法正确的是

A．酸与碱的反应一定是中和反应

B．醇与酸的反应一定是酯化反应

C．酯的碱性水解就是皂化反应

D．复分解反应一定不是氧化还原反应