当事人对农村土地承包仲裁机构的仲裁裁决不服的，可以在收到裁决书之日起()日内向人民法院起诉。

A．30

B．45

C．60

D．90

—She looks very happy. She ______ have passed the exam.

—I guess so. It’s not difficult after all.

A．should

B．could

C．must

D．might